atomic clock Atomic clock at the center of the universe?
How fast or slow would an atomic clock count time at the very center of the universe/gravity. Zero motion in any direction.
The clock would be placed at the point where the big bang occured...
There's no such place as the center of the universe, nor such a thing as absolute "zero motion." All motion is relative.
There is no such place as "the point where the big bang occurred." The big bang happened--- is happening--- everywhere. All points in space recede from all other points in direct proportion to their distances. The big bang wasn't an explosion that happened somewhere in space. The big bang is the expansion of space itself.
This watch combines the toughness of G-Shock with the convenience of a light powered watch. And the Casio Wave Ceptor Atomic watches receive radio signals from the most accurate clock in the world - the cesium atomic clock at the National Bureau of Standards Light Powered - No batteries to change, ever! Shock Resistant 200 meter water resistant World time in 26 time zones, 30 cities Time recorder function - 30 records Daylight savings time on/off Auto Electro-luminscent backlight with afterglow 1/100 second stopwatch with measuring capacity up to : 23:59'59.99" Stopwatch measuring modes: elapsed time, split time, 1st-2nd place times 4 alarms with snooze Hourly time signal Auto-calendar ( pre-programmed until the year 2039) 12/24- hour formats Accuracy: +/- 15 seconds per month
This watch combines the toughness of G-Shock with the convenience of a light powered watch. And the Casio Wave Ceptor Atomic watches receive radio signals from the most accurate clock in the world - the cesium atomic clock at the National Bureau of Standards Light Powered - No batteries to change, ever! Shock Resistant 200 meter water resistant World time in 26 time zones, 30 cities Daylight savings time on/off Auto Electro-luminscent backlight with afterglow 1/100 second stopwatch with measuring capacity up to : 23:59'59.99" Stopwatch measuring modes: elapsed time, split time, 1st-2nd place times 4 alarms with snooze Hourly time signal Auto-calendar ( pre-programmed until the year 2039) 12/24- hour formats Accuracy: +/- 15 seconds per month
This watch combines the toughness of G-Shock with the convenience of a light powered watch. And the Casio Wave Ceptor Atomic watches receive radio signals from the most accurate clock in the world - the cesium atomic clock at the National Bureau of Standards Light Powered - No batteries to change, ever! Shock Resistant 200 meter water resistant World time in 26 time zones, 30 cities Daylight savings time on/off Auto Electro-luminscent backlight with afterglow 1/100 second stopwatch with measuring capacity up to : 23:59'59.99" Stopwatch measuring modes: elapsed time, split time, 1st-2nd place times 4 alarms with snooze Hourly time signal Auto-calendar ( pre-programmed until the year 2039) 12/24- hour formats Accuracy: +/- 15 seconds per month
This watch combines the toughness of G-Shock with the convenience of a light powered watch. And the Casio Wave Ceptor Atomic watches receive radio signals from the most accurate clock in the world - the cesium atomic clock at the National Bureau of Standards Black Ion Plated Case and Bracelet with Blue Ion Plated Bezel Light Powered - No batteries to change, ever! Shock Resistant 200 meter water resistant World time in 26 time zones, 30 cities Time recorder function - 30 records Daylight savings time on/off Auto Electro-luminscent backlight with afterglow 1/100 second stopwatch with measuring capacity up to : 23:59'59.99" Stopwatch measuring modes: elapsed time, split time, 1st-2nd place times 4 alarms with snooze Hourly time signal Auto-calendar ( pre-programmed until the year 2039) 12/24- hour formats Accuracy: +/- 15 seconds per month
Radio controlled movement automatically sets to any U.S. time zone as it receives signals from the atomic clock in Fort Collins, Colorado Automatically adjusts to Daylight Saving Time and back to Standard Time Solid wood case with a Mahogany finish Protective glass lens Engravable plate included for personalization Free battery included as you gift with purchase - Requires 1 AA Battery Approximate Weight: 3 lbs 7.5" High x 10" Wide x 2.75" Deep
The new Casio Atomic Baby-G brings atomic timekeeping to the durability and fashion of the Baby-G. Atomic Timekeeping Shock Resistant 100M Water Resistant (330ft) Electro-Luminescent Backlight Light with Afterglow World Time (48 cities) 1/100 Second Stopwatch Hourly Time Signal Auto Calendar 12/24 Hour Formats Battery CR1220 Module 3772
The new Casio Atomic Baby-G brings atomic timekeeping to the durability and fashion of the Baby-G. Atomic Timekeeping Shock Resistant 100M Water Resistant (330ft) Electro-Luminescent Backlight Light with Afterglow World Time (48 cities) 1/100 Second Stopwatch Hourly Time Signal Auto Calendar 12/24 Hour Formats Battery CR1220 Module 3772
This new Promaster Atomic combines the best features of the Skyhawk AT and the Promaster Carbon series to create a flight chronograph with a rugged carbon fiber bezel, atomic accuracy and world time in 43 cities Stainless Steel Case and Bracelet Atomic Timekeeping with Radio Controlled Accuracy Citizen Eco-Drive Solar Power Technology never needs a battery 180 Day Power Reserve; 2.5 Year Power Reserve with Power-Save Function World Time in 43 Cities 2 Alarms 1/100 Second Chronograph Measures up to 24 Horus 99 Minute Countdown Timer Perpetual Calendar Digital Display Light Greenwich Mean Time Display One-Way Rotating Elapsed Time Carbon Fiber Bezel Non-Reflective Mineral Glass Crystal Power Reserve Indicator Water Resistant to 200 Meters (660 Feet) Bracelet features a Fold-Over Safety Clasp with Push-Button Release 44mm Case Width (Approximately 1 3/4") 15mm Case Thickness (Approximately 5/8")
MORE FEATURES THAN EVER. NEW CITIZEN ECO-DRIVE TITANIUM SKYHAWK AT The new, fully loaded 3rd generation Skyhawk redefines atomic timekeeping with radio controlled accuracy and Eco-Drive technology. Radio signals are received both automatically and on-demand by the fully loaded Skyhawk A-T. Atomic Timekeeping with Radio Accuracy Eco-Drive Technology (Solar Powered so you never have to change a battery) World Time for 43 Cities 2 Alarms 24 Hour 1/100 Second Chronograph Perpetual Calendar to the year 2100 Analog/Digital Displays 99 Minute Countdown Timer with Alarm Water Resistant to 200 Meters (660 Feet) 3-Day Low Charge Warning (Will notify you 3 Days before the watch completely stops) Power Reserve Indicator Maximum Power Reserve at Full Charge is 180 Days Stainless Steel Case Fold-Over Clasp with Double Hidden Push Button Release 45mm Case Width without Crown
MORE FEATURES THAN EVER. NEW CITIZEN ECO-DRIVE SKYHAWK AT The new, fully loaded 3rd generation Skyhawk redefines atomic timekeeping with radio controlled accuracy and Eco-Drive technology. Radio signals are received both automatically and on-demand by the fully loaded Skyhawk A-T. Atomic Timekeeping with Radio Accuracy Eco-Drive Technology (Solar Powered so you never have to change a battery) World Time for 43 Cities 2 Alarms 24 Hour 1/100 Second Chronograph Perpetual Calendar to the year 2100 Analog/Digital Displays 99 Minute Countdown Timer with Alarm Water Resistant to 200 Meters (660 Feet) 3-Day Low Charge Warning (Will notify you 3 Days before the watch completely stops) Power Reserve Indicator Maximum Power Reserve at Full Charge is 180 Days Stainless Steel Case Fold-Over Clasp with Double Hidden Push Button Release 45mm Case Width without Crown
The 3rd generation Skyhawk redefines atomic timekeeping with radio controlled accuracy and Eco-Drive Technology. Radio signals are received both automatically and on-demand by the fully loaded Skyhawk A-T. Atomic Timekeeping wit Radio Controlled Accuracy Solar Powered - No need to change a battery World Time in 43 Cities 2 Alarms 1/100 Second Chronograph Measures up to 24 Hours 99 Minute Countdown Timer Perpetual Calendar Digital Display Light Water Resistant to 200 Meters (660 Feet) Greenwich Mean Time Display Rotating Slide Rule Bezel Stainless Steel Case and Bracelet with Black Ion Plating Non-Reflective Mineral Glass Crystal Power Reserve Indicator (180 Day Power Reserve when fully charged - 2.5 Year Power Reserve with Power Save Function - *150 Hours in Average Lighting to Acheive a full charge) Bracelet Features a Fold Over Clasp with Double Hidden Push Button Release 45mm Case Width (Approximately 1 3/4")
NOW IN TITANIUM, NEW CITIZEN ECO-DRIVE TITANIUM SKYHAWK AT The new, fully loaded 3rd generation Skyhawk redefines atomic timekeeping with radio controlled accuracy and Eco-Drive technology. Radio signals are received both automatically and on-demand by the fully loaded Skyhawk A-T. Atomic Timekeeping with Radio Accuracy Eco-Drive Technology (Solar Powered so you never have to change a battery) World Time for 43 Cities 2 Alarms 24 Hour 1/100 Second Chronograph Perpetual Calendar to the year 2100 Analog/Digital Displays 99 Minute Countdown Timer with Alarm Water Resistant to 200 Meters (660 Feet) 3-Day Low Charge Warning (Will notify you 3 Days before the watch completely stops) 180 Day Power Reserve when Fully Charged (Approximately 2.5 Years with Power Save Function - 150 Hours to fully charge in average lighting) Power Save Function Power Reserve Indicator Titanium Case and Bracelet Fold-Over Clasp with Double Hidden Push Button Release 45mm Case Width without Crown (Approximately 1 3/4")
Multi-Band Atomic Timekeeping (US, UK, Germany, Japan) Tough Solar Power Digital Compass Altimeter w/Alarm & Memory Altitude Barometer Thermometer 100M Water Resistant Full Auto EL Backlight with Afterglow World Time 5 Daily Alarms Countdown Timer 1/100 Second Stopwatch Hourly Time Signal Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Button Operation Tone On/Off Accuracy: ±20 seconds per month (with no signal calibration) Battery Power Indicator Power Saving Function
Multi-Band Atomic Timekeeping (US, UK, Germany, Japan) Tough Solar Power Digital Compass Altimeter w/Alarm & Memory Altitude Barometer Thermometer 100M Water Resistant Full Auto EL Backlight with Afterglow World Time 5 Daily Alarms Countdown Timer 1/100 Second Stopwatch Hourly Time Signal Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Button Operation Tone On/Off Accuracy: ±20 seconds per month (with no signal calibration) Battery Power Indicator Power Saving Function
Titanium Case and Bracelet Multi-Band Atomic Timekeeping (US, UK, Germany, Japan) Tough Solar Power Digital Compass Altimeter w/Alarm & Memory Altitude Barometer Thermometer 100M Water Resistant Full Auto EL Backlight with Afterglow World Time 5 Daily Alarms Countdown Timer 1/100 Second Stopwatch Hourly Time Signal Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Button Operation Tone On/Off Accuracy: ±20 seconds per month (with no signal calibration) Battery Power Indicator Power Saving Function
Combining the best elements of Pathfinder & Sea Pathfinder, Casio has produced the best Pathfinder to date. The Multi-Band 5 Atomic Solar Pathfinder steps beyond its core competencies of Digital Compass, Altimeter, Barometer and Thermometer by adding Tide and Moon Graphs and Moon Age Data. And if that wasn’t enough, it's 200M Water Resistant! Tide Graph (based on a combination of preset and user input data) Moon Data (moon age based on current date or user input data, moon phase graph) Multi-Band Atomic Timekeeping (US, UK, Germany, Japan) Tough Solar Power - No batteries to change - will run for up to 5 months when fully charged without further light exposure. Digital Compass in one degree increments Altimeter w/Alarm & 20 record Memory (-2,300 to 32,800ft) Barometer with pressure tendency and pressure differential graphs Thermometer 200 Meters Water Resistant Full Auto EL Backlight with Afterglow World Time in 29 times zones (33 cities), with city code display and daylight savings on/off 5 Daily Alarms Countdown Timer (Yacht Timer) 1 to 60 minutes in 1 second increments 1/100 Second Stopwatch with elapsed time, split time, 1st-2nd place time capability Hourly Time Signal Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Button Operation Tone On/Off Accuracy: ±20 seconds per month (with no signal calibration) Battery Power Indicator Power Saving Function Case Size 56.2 x 50.6 mm by 13.9mm thick. Weight 79 grams
Atomic Timekeeping Receives time calibration radio signals which keep the displayed time accurate Auto receive function (4 times per day) Manual receive function Signal: WWVB, Frequency: 60kHz Tough Solar Power Shock Resistant 200M Water Resistant Auto EL Backlight with Afterglow World Time29 times zones (30 cities), city code display, daylight saving on/off 4 Daily Alarms & 1 Snooze Alarm Time Recorder; Memory capacity: 30 records (each record contains month, day, hour, minutes, seconds) 1/100 second stopwatch Measuring capacity: 23:59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times Hourly Time Signal Auto Calendar (pre-programmed until the year 2039) 12/24 Hour Formats Accuracy: ±15 seconds per month (with no signal calibration) Storage Battery CTL1616 (Rechargeable Solar Battery Cell) Battery Power Indicator Power Saving Function Approx. battery life: 11 months on full charge (without further exposure to light) Module 2688 Case Width: 45mm (Approximately 1 3/4") Case Thickness: 15mm (Approximately 5/8")
The popular titanium Blue Angels Skyhawk, now available in the Skyhawk AT radio controlled series, the ultimate Blue Angels Skyhawk watch. Atomic Timekeeping with Radio Controlled Accuracy Solar Powered - No need to change a battery World Time in 43 Cities 2 Alarms 1/100 Second Chronograph Measures up to 24 Hours 99 Minute Countdown Timer Perpetual Calendar Digital Display Light Water Resistant to 200 Meters (660 Feet) Greenwich Mean Time Display Rotating Slide Rule Bezel Titanium Case and Bracelet Non-Reflective Mineral Glass Crystal Power Reserve Indicator (180 Day Power Reserve when fully charged - 2.5 Year Power Reserve with Power Save Function - *150 Hours in Average Lighting to Achieve a full charge) Bracelet Features a Fold Over Clasp with Double Hidden Push Button Release Official Blue Angels Insignia appears on Caseback 45mm Case Width (Approximately 1 3/4")
Silver-Tone Titanium Multi-Band 5 Pathfinder Watch features Atomic Timekeeping, Digital Dial Code and Titanium Band. Features Tough Solar Power, Digital Compass, Altimeter, Barometer and Thermometer. Multi-Band Atomic Timekeeping (US, UK, Germany, Japan) Receives time calibration radio signals which keep the displayed time accurate Auto receive function (6 times per day) Manual receive function Signal: US WWVB, UK MSF, Germany DCF77, Japan JJY40/JJY60 Frequency: US 60kHz, UK 60kHz, Germany 77.5kHz, Japan 40/60kHz Tough Solar Power Digital Compass 16 points of measurement Measuring range: 0 to 359 degrees Measuring unit: 1 degree Altimeter Measuring range: -700 to 10,000m (-2,300 to 32,800ft) Measuring unit: 5m (20ft) Auto memory measurements Altimeter Memory Memory capacity: 40 records Measurement data: altitude, month, date, time High / Low altitude memory Cumulative ascent / descent memory Relative altitude display Altitude tendency graph Altitude differential graphic Altitude alarm Barometer Display range: 260 to 1,100 hPa (7.65 to 32.45 inHg) Display unit: 1 hPa (0.05 inHg) Atmospheric pressure tendency graph Atmospheric pressure differential grapic Thermometer Display range: -10 to 60 C (14 to 140 F) Display unit: 0.1 C (0.2 F) 100M Water Resistant Low Temperature Resistant (-10 C / 14 F) Full Auto EL Backlight with Afterglow Duplex LCD World Time 29 times zones (30 cities), city code display, daylight saving on/off 5 Daily Alarms Countdown Timer Measuring unit: 1 second Countdown range: 1 minute to 60 minutes Auto-repeat function 1/100 second stopwatch Measuring capacity: 9:59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times Hourly Time Signal Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Accuracy: ±15 seconds per month (with no signal calibration) Storage Battery CTL1616 Battery Power Indicator Power Saving Function Approximate battery life: 5 months on full charge (without further exposure to light) Module 3043 Size of case/total weight: 62.3 X 52.2 X 14.2mm / 118g
Account limit of 2098 requests per hour exceeded.
Ceramic Hobs live aus Berlin Durchführen ATOMIC CLOCK
How to change from Pacific time to Eastern time on a Centrios Atomic clock?
1. In normal time mode press MODE button to enter ALARM mode.
The temperature readings are from internal electronics. Most clocks like that will give internal temps; some have the added feature of external (usually wireless) sensors for outside temps.
The "weather forecasts" are just based on the local barometric pressure and aren't particularly accurate. For instance, rising pressure = sunny, but that could also indicate a front moving through and some rain, or falling pressure = rain, but that could mean the front is passed and the skies are clearing.
Umm — transmit? They are designed to receive the US atomic clock broadcasts on shortwave (5, 10, 15, and 20 MHz from Ft. Collins, CO or Hawaii) and interpret the signals to reprogram the clock to the correct time once a day (usually 1 to 4 AM local time).
You may find that the one with weather also has a relative humidity sensor. If that would be useful where you live, then it might be a reason to choose it over the other.
Timex Iron Man Triathlon Watch StrapWhen I first got the watch I really liked it. It has a lot of features, and it is very comfortable on my wrist. The only problem is that it keeps horrible time. You would expect a digital watch not to have this problem, but this one does. I thought with a digital I could set the time, and never worry about it again. I set the time according to the atomic clock (time.gov), but only a week later it was 30 seconds off. That would be acceptable with a mechanical watch but this is a quartz digital, I expect it to only be a few seconds off at the end of the month. My 15 dollar mechanical watch that has never been serviced in all the years I have owned it keeps better time than this new digital watch. All the extra features on this watch are kind of cool, but I didn’t get it for a stopwatch or an alarm clock. I got it to tell time. Even replacing the battery did nothing. And the water resistance is a lie, I took a shower with it on the first day I got it and it was cloudy and had droplets on the inside of the watch. How can they claim to have 100m water resistance (which should be suitable for deep sea diving) when this watch isn’t even shower resistant.
Doomsday clock is just cr*p, the idea is to reflect the stability in the nuclear world, right now they are scared about the Iranian nuclear and where it might go, and China. It really has no practical application, and is one of the weapons of mass distraction used in the western world.
Ok, this is a source of some confusion, but basically here's the scoop:
There are two systems of time, "Universal Time" (UT1), and "Universal Time Coordinated" (UTC). One day in UT1 is measured by one rotation of the Earth as seen from the average position of the Sun. One day in UTC is measured by 24 hours passing on an atomic clock.
Now, when it started on January 1st, 1972, UTC was perfectly in line with UT1, and that is actually what defines an hour in UTC time – 1/24th of an Earth rotation in 1972. However, the Earth is very slightly slowing down its rotation due to the moon's tidal force. Specifically, it slows at a rate of .002 seconds a day per century.
So, in 2072, the UT1 day will be longer by .002 seconds than the 1972 day (and by transitivity, .002 seconds longer than the UTC day, too). In 2172, a UT1 day will be .004 seconds longer than the UTC day…in 2272, the UT1 day will be .006 seconds longer, and so on.
Now, here's where the confusion comes in: Even though the *rate* of change of the UT1 day is miniscule, it adds up to a large *total difference* in time between UT1 and UTC over the long haul. Note the important distinction in those two: rate vs. total difference.
In other words, say that right now in 2008, the UT1 day is now .001 seconds longer than the UTC day (it's not quite that much yet, but it'll make the math easier). Let's say that the "time folks" just inserted a leap second so that right now the UT1 and UTC times are perfectly synchronized. Tomorrow, they'll be .001 seconds different. The day after tomorrow they'll be .002 seconds different, the next day they'll be .003 seconds different, and so on. It won't take very long (about 1.5 years) until they're more than half a second off, and they'll have to insert another second to synchronize the two times again.
The point that I believe both Phil and the USNO is trying to make is that even though the rate of Earth's slowing is relatively small, that can add up to a big difference in a relatively short amount of time.
Edited for clarity: The confusion that some people have is that they get these two concepts confused…they assume that if we have to insert 1 second every 1.5 years, then the *rate* of slowing must be 1 second/1.5 years.
This is not true, but to produce a mathematical result that the Earth will come to a dead halt in just a few thousand years (rather than just exponentially longer days), think of this in terms of frequency rather period: When UTC and UT1 are in sync, the Earth makes 1 rotation in 86,400 sec (one UTC day). In 1.5 years, it will only make 0.999988 rotations in 86,400 sec. In 3 years, it will only make .999976 rotations in 86,400 sec. At this rate, it will take 129,601.5 years before it makes zero rotations in that time period. At least, I *think* that's how they come to that conclusion. I'm sure you could greatly shorten that time with the added fact that leap seconds will have to be added more and more frequently as UT1 runs even slower compared to UTC.
A quick side note: this has absolutely nothing to do with the extra day inserted on leap years – that's simply due to the fact that one year is closer to 365.25 days than just 365 days. Since it's not an integer number, we need an extra day every 4 years to account for that extra 0.25.
Thanks for the tip. I go to Batteries Plus on Canal for all my rechargeable needs, but it never occurred to me to take it there. Duh
Actually I went back today to have them fix or refund, but after several minutes of no one at the mini store, I walked around looking at solar watches with atomic clock setting (thinking spending $$ now will save me rebuying cheap watches every two years). But at a different mall mini shop (Dakota watches), I got waited on by someone I wish I had worked with yesterday, and I did get a new watch that didn't have all those expensive features.
Now I got a dress up (with alarms) and work (no audio alarm) watch.
Just received mine today and love the look and features. bulky but very cool in my opinion. Got for an everyday type of use and tend to be hard on my stuff so this should fit the bill. My last G-shock is still working since 1983… Had no problem with getting it to sync for the time calibration.
According to relativity, whether two events are simultaneous depends on the observer. So, there is no such thing as clocks that run completely simultaneously in all frames of reference. This was the exact problem (how to calibrate clocks at various Swiss train stations) that caused Albert Einstein to come up with special relativity.
However, we adopt by convention that time is more or less what we say it is, and that we can keep relatively accurate time in order to suit our day to day purposes. That's good enough for most people.
Hi, JT here. I recently received a Projection Alarm Clock as a gift and thought that it was just the coolest thing ever. I've started giving them to friends and thought I'd do a little research and put a site together about Projection Clocks and Atomic Clocks. I hope you enjoy!
Hi, JT here. I recently received a Projection Alarm Clock as a gift and thought that it was just the coolest thing ever. I've started giving them to friends and thought I'd do a little research and put a site together about Projection Clocks and Atomic Clocks. I hope you enjoy!
15 Comments
man I don't know how I missed winning this…I even used the atomic clock online at time.gov!
The temperature readings are from internal electronics. Most clocks like that will give internal temps; some have the added feature of external (usually wireless) sensors for outside temps.
The "weather forecasts" are just based on the local barometric pressure and aren't particularly accurate. For instance, rising pressure = sunny, but that could also indicate a front moving through and some rain, or falling pressure = rain, but that could mean the front is passed and the skies are clearing.
Umm — transmit? They are designed to receive the US atomic clock broadcasts on shortwave (5, 10, 15, and 20 MHz from Ft. Collins, CO or Hawaii) and interpret the signals to reprogram the clock to the correct time once a day (usually 1 to 4 AM local time).
You may find that the one with weather also has a relative humidity sensor. If that would be useful where you live, then it might be a reason to choose it over the other.
Timex Iron Man Triathlon Watch StrapWhen I first got the watch I really liked it. It has a lot of features, and it is very comfortable on my wrist. The only problem is that it keeps horrible time. You would expect a digital watch not to have this problem, but this one does. I thought with a digital I could set the time, and never worry about it again. I set the time according to the atomic clock (time.gov), but only a week later it was 30 seconds off. That would be acceptable with a mechanical watch but this is a quartz digital, I expect it to only be a few seconds off at the end of the month. My 15 dollar mechanical watch that has never been serviced in all the years I have owned it keeps better time than this new digital watch. All the extra features on this watch are kind of cool, but I didn’t get it for a stopwatch or an alarm clock. I got it to tell time. Even replacing the battery did nothing. And the water resistance is a lie, I took a shower with it on the first day I got it and it was cloudy and had droplets on the inside of the watch. How can they claim to have 100m water resistance (which should be suitable for deep sea diving) when this watch isn’t even shower resistant.
Doomsday clock is just cr*p, the idea is to reflect the stability in the nuclear world, right now they are scared about the Iranian nuclear and where it might go, and China. It really has no practical application, and is one of the weapons of mass distraction used in the western world.
Ok, this is a source of some confusion, but basically here's the scoop:
There are two systems of time, "Universal Time" (UT1), and "Universal Time Coordinated" (UTC). One day in UT1 is measured by one rotation of the Earth as seen from the average position of the Sun. One day in UTC is measured by 24 hours passing on an atomic clock.
Now, when it started on January 1st, 1972, UTC was perfectly in line with UT1, and that is actually what defines an hour in UTC time – 1/24th of an Earth rotation in 1972. However, the Earth is very slightly slowing down its rotation due to the moon's tidal force. Specifically, it slows at a rate of .002 seconds a day per century.
So, in 2072, the UT1 day will be longer by .002 seconds than the 1972 day (and by transitivity, .002 seconds longer than the UTC day, too). In 2172, a UT1 day will be .004 seconds longer than the UTC day…in 2272, the UT1 day will be .006 seconds longer, and so on.
Now, here's where the confusion comes in: Even though the *rate* of change of the UT1 day is miniscule, it adds up to a large *total difference* in time between UT1 and UTC over the long haul. Note the important distinction in those two: rate vs. total difference.
In other words, say that right now in 2008, the UT1 day is now .001 seconds longer than the UTC day (it's not quite that much yet, but it'll make the math easier). Let's say that the "time folks" just inserted a leap second so that right now the UT1 and UTC times are perfectly synchronized. Tomorrow, they'll be .001 seconds different. The day after tomorrow they'll be .002 seconds different, the next day they'll be .003 seconds different, and so on. It won't take very long (about 1.5 years) until they're more than half a second off, and they'll have to insert another second to synchronize the two times again.
The point that I believe both Phil and the USNO is trying to make is that even though the rate of Earth's slowing is relatively small, that can add up to a big difference in a relatively short amount of time.
Edited for clarity: The confusion that some people have is that they get these two concepts confused…they assume that if we have to insert 1 second every 1.5 years, then the *rate* of slowing must be 1 second/1.5 years.
This is not true, but to produce a mathematical result that the Earth will come to a dead halt in just a few thousand years (rather than just exponentially longer days), think of this in terms of frequency rather period: When UTC and UT1 are in sync, the Earth makes 1 rotation in 86,400 sec (one UTC day). In 1.5 years, it will only make 0.999988 rotations in 86,400 sec. In 3 years, it will only make .999976 rotations in 86,400 sec. At this rate, it will take 129,601.5 years before it makes zero rotations in that time period. At least, I *think* that's how they come to that conclusion. I'm sure you could greatly shorten that time with the added fact that leap seconds will have to be added more and more frequently as UT1 runs even slower compared to UTC.
A quick side note: this has absolutely nothing to do with the extra day inserted on leap years – that's simply due to the fact that one year is closer to 365.25 days than just 365 days. Since it's not an integer number, we need an extra day every 4 years to account for that extra 0.25.
great video t-Up
Nice one. I have this track also on a Kill out compilation I believe
Thanks for the tip. I go to Batteries Plus on Canal for all my rechargeable needs, but it never occurred to me to take it there. Duh
Actually I went back today to have them fix or refund, but after several minutes of no one at the mini store, I walked around looking at solar watches with atomic clock setting (thinking spending $$ now will save me rebuying cheap watches every two years). But at a different mall mini shop (Dakota watches), I got waited on by someone I wish I had worked with yesterday, and I did get a new watch that didn't have all those expensive features.
Now I got a dress up (with alarms) and work (no audio alarm) watch.
"Bang goes the theory" flew Atomic Clock 44hrs UK NZ UK to prove relativity effects are real. One left behind did show diff time
Just received mine today and love the look and features. bulky but very cool in my opinion. Got for an everyday type of use and tend to be hard on my stuff so this should fit the bill. My last G-shock is still working since 1983… Had no problem with getting it to sync for the time calibration.
About a year ago I got an alarm clock that is set automatically by the atomic clock in Colorado, it works as smoothly as you
According to relativity, whether two events are simultaneous depends on the observer. So, there is no such thing as clocks that run completely simultaneously in all frames of reference. This was the exact problem (how to calibrate clocks at various Swiss train stations) that caused Albert Einstein to come up with special relativity.
However, we adopt by convention that time is more or less what we say it is, and that we can keep relatively accurate time in order to suit our day to day purposes. That's good enough for most people.
Poland.