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cbrenthus · 30 March 2007, 03:25 AM

I see alot of threads and post where people say that their watch is gaining or losing seconds. My question is how do you know? What are you comparing the watch against to see how accurate it is?

The only thing I have tried is opening the time/date window on my computer, and comparing second hands. It appears to have gained ~7 seconds in a week, not bad at all from what I understand. Is this a proper way to compare?

Erix · 30 March 2007, 03:37 AM

Hi there,

You could use an atomic watch like US navy watch @ http://www.time.gov/
for the official US time, or http://wwp.greenwichmeantime.com/

Set the time on your watch and check it against the atomics after 24hours.

To have better accuracy.
Set the time on your watch at say 10am, and check against the atomics in 10 days (at 10am).
Divide the difference with 10 and you will get you difference +/- secs /day .

Have fun

astcell · 30 March 2007, 03:40 AM

1 Mississippi, 2 Mississippi, 3 Mississippi,....

Erix · 30 March 2007, 03:42 AM

Quote:

Originally Posted by astcell

1 Mississippi, 2 Mississippi, 3 Mississippi,....

JJ Irani · 30 March 2007, 03:56 AM

Quote:

Originally Posted by astcell

1 Mississippi, 2 Mississippi, 3 Mississippi,....

cbrenthus · 30 March 2007, 04:25 AM

Quote:

Originally Posted by astcell

1 Mississippi, 2 Mississippi, 3 Mississippi,....

*Ring ring...

RSC: Hello, Rolex Service Center, how may we help you?

CUST: I would like to bring my watch in for service.

RSC: What seems to be the problem?

CUST: It's running too fast!

RSC: Would you happen to know how fast it's running?

CUST: About 20 Mississippis a day!

JJ Irani · 30 March 2007, 04:28 AM

Quote:

Originally Posted by cbrenthus

*Ring ring...

RSC: Hello, Rolex Service Center, how may we help you?

CUST: I would like to bring my watch in for service.

RSC: What seems to be the problem?

CUST: It's running too fast!

RSC: Would you happen to know how fast it's running?

CUST: About 20 Mississippis a day!

astcell · 30 March 2007, 04:57 AM

Call Rolex every day and ask what time is it. After about 2 weeks you will have an idea about how off your watch is. And the phone bill will probably be the price of a Rolex.

Goodwatch · 30 March 2007, 05:26 AM

I use my sun dial

Alex Stylianou · 30 March 2007, 06:23 AM

Quote:

Originally Posted by astcell

1 Mississippi, 2 Mississippi, 3 Mississippi,....

... 4 Mississippi 5 - 1bn Missipi

astcell · 30 March 2007, 06:30 AM

Quote:

Originally Posted by Goodwatch

I use my sun dial

A sundial! Rah! Rah! Rah!

(tell me you get the joke)

nko51 · 30 March 2007, 07:10 AM

Quote:

Originally Posted by astcell

1 Mississippi, 2 Mississippi, 3 Mississippi,....

Andad · 30 March 2007, 06:10 PM

www.rolex.com/en/index.jsp#/en/xml/index

Seems to work for me in Adelaide.

I want this Rolex.

walds11 · 30 March 2007, 08:50 PM

I don't check the accuracy of my watches that much. I am not anal like that. Maybe only when I have to reset the date.

Lol-x · 30 March 2007, 10:49 PM

I hope to use a GPS tomorrow, one that came built into my new cell phone.
Does anyone know if a GPS reading is more accurate than an internet reading from an atomic clock? They both have to travel some distance to get to you, but I thought the GPS, compensated for the distance travelled and time taken from the satellite atomic clock to the GPS device.

astcell · 30 March 2007, 11:16 PM

GPS sats are in geosynchronous orbit at about 23k miles over the center of the earth. Given the speed of light at 186,282.397 miles per second, I think you're fine for the accuracy of a Rolex.

Lol-x · 30 March 2007, 11:25 PM

Hi Robert, I'm not going to get all geosanctimonious about it

Well I guess from what you say, yeah it will be good enough to set a watch.

jaycee · 31 March 2007, 12:44 PM

GPS is excellent for telling the time. It compensates for everything! All the satellites have atomic clocks on board and various correction methods are used to take account of relativistic effects (you'll have to read up on Einstein for that one but, basically, moving clocks run slow and the velocity of a GPS satellite is high enough for this effect to be noticeable) and to ensure that the GPS unit you're using also knows the correct time. As light (and radio waves) travel 186 miles in a millisecond, high accuracy is needed at both ends, though the actual means by which GPS determines your position means that atomic clock accuracy is not needed by your GPS receiver, which is just as well! It still leaves you with a very accurate clock, though.

In the UK, clocks with a radio receiver built-in which update from an atomic clock are very cheap. I presume these are also available in other countries?

astcell · 31 March 2007, 11:53 PM

Watches with a radio receiver are getting big here in the US, they run about $30-$100 for the Casio brand ones. The hard part is setting your time zone.

mike · 1 April 2007, 12:17 AM

Quote:

Originally Posted by astcell

Watches with a radio receiver are getting big here in the US, they run about $30-$100 for the Casio brand ones. The hard part is setting your time zone.

Yep...I've used this to set others.

Lol-x · 1 April 2007, 01:13 AM

Unfortunately in Australia there doesn't seem to be watches or clocks that are capable of atomic clock radio reception. Thanks jaycee
That's a handy device Mike.
I just found out that my GPS software is fixed to UTC time, but that's O.K. I can still use it to set the correct minutes and seconds on my watches :)

Rockrolex · 1 April 2007, 01:20 AM

Like Mike, I use this one to set my other watches.

30 March 2007, 03:25 AM	#1
cbrenthus "TRF" Member Join Date: Feb 2007 Real Name: Brandon Location: FL Watch: ing my second hand Posts: 869	How do you check accuracy? I see alot of threads and post where people say that their watch is gaining or losing seconds. My question is how do you know? What are you comparing the watch against to see how accurate it is? The only thing I have tried is opening the time/date window on my computer, and comparing second hands. It appears to have gained ~7 seconds in a week, not bad at all from what I understand. Is this a proper way to compare? __________________ www.bknicholas.com www.myspace.com/bknicholas

30 March 2007, 03:37 AM	#2
Erix "TRF" Member Join Date: Dec 2006 Location: Nice, France Watch: D Sub date 16610 Posts: 929	Hi there, You could use an atomic watch like US navy watch @ http://www.time.gov/ for the official US time, or http://wwp.greenwichmeantime.com/ Set the time on your watch and check it against the atomics after 24hours. To have better accuracy. Set the time on your watch at say 10am, and check against the atomics in 10 days (at 10am). Divide the difference with 10 and you will get you difference +/- secs /day . Have fun __________________ Nice is nice

30 March 2007, 05:26 AM	#9
Goodwatch "TRF" Member Join Date: Aug 2005 Real Name: Frans ® Location: Rotterdam Watch: the sunrise... Posts: 10,230	I use my sun dial __________________ Member# 127

30 March 2007, 06:10 PM	#13
Andad 2024 SubLV41 Pledge Member Join Date: Nov 2006 Real Name: Eddie Location: Australia Watch: A few. Posts: 37,521	www.rolex.com/en/index.jsp#/en/xml/index Seems to work for me in Adelaide. I want this Rolex. __________________ E

1 April 2007, 01:20 AM	#22
Rockrolex TRF Moderator & 2024 SubLV41 Patron Join Date: May 2005 Real Name: God Location: Washington, D.C. Watch: What do you think? Posts: 37,966	Like Mike, I use this one to set my other watches. __________________ Despite the high cost of living, it's still very popular. *Tosser Cabinet Member* Official Member: 'Perpetual 30' Vegas International GTG 2016 Official Member "WIS-CON" Las Vegas International GTG 2017 Official Member "WIS-CON" Las Vegas International GTG 2018 Official Member "WIS-CON" Las Vegas International GTG 2019

30 March 2007, 03:40 AM	#3
astcell "TRF" Member Join Date: Aug 2006 Real Name: Robert Location: Angelus Oaks, CA Watch: 116713 Posts: 6,828	1 Mississippi, 2 Mississippi, 3 Mississippi,....

30 March 2007, 04:57 AM	#8
astcell "TRF" Member Join Date: Aug 2006 Real Name: Robert Location: Angelus Oaks, CA Watch: 116713 Posts: 6,828	Call Rolex every day and ask what time is it. After about 2 weeks you will have an idea about how off your watch is. And the phone bill will probably be the price of a Rolex.

30 March 2007, 08:50 PM	#14
walds11 "TRF" Member Join Date: Jul 2005 Real Name: Adam Location: Philly ‘burbs Posts: 5,660	I don't check the accuracy of my watches that much. I am not anal like that. Maybe only when I have to reset the date.

30 March 2007, 10:49 PM	#15
Lol-x Facilitator Join Date: Nov 2005 Real Name: Steve Location: Omnipresent Posts: 33,587	I hope to use a GPS tomorrow, one that came built into my new cell phone. Does anyone know if a GPS reading is more accurate than an internet reading from an atomic clock? They both have to travel some distance to get to you, but I thought the GPS, compensated for the distance travelled and time taken from the satellite atomic clock to the GPS device.

30 March 2007, 11:16 PM	#16
astcell "TRF" Member Join Date: Aug 2006 Real Name: Robert Location: Angelus Oaks, CA Watch: 116713 Posts: 6,828	GPS sats are in geosynchronous orbit at about 23k miles over the center of the earth. Given the speed of light at 186,282.397 miles per second, I think you're fine for the accuracy of a Rolex.

30 March 2007, 11:25 PM	#17
Lol-x Facilitator Join Date: Nov 2005 Real Name: Steve Location: Omnipresent Posts: 33,587	Hi Robert, I'm not going to get all geosanctimonious about it Well I guess from what you say, yeah it will be good enough to set a watch.

31 March 2007, 12:44 PM	#18
jaycee "TRF" Member Join Date: Dec 2005 Real Name: John Location: Halesworth, UK Watch: GMT Master II Posts: 69	GPS is excellent for telling the time. It compensates for everything! All the satellites have atomic clocks on board and various correction methods are used to take account of relativistic effects (you'll have to read up on Einstein for that one but, basically, moving clocks run slow and the velocity of a GPS satellite is high enough for this effect to be noticeable) and to ensure that the GPS unit you're using also knows the correct time. As light (and radio waves) travel 186 miles in a millisecond, high accuracy is needed at both ends, though the actual means by which GPS determines your position means that atomic clock accuracy is not needed by your GPS receiver, which is just as well! It still leaves you with a very accurate clock, though. In the UK, clocks with a radio receiver built-in which update from an atomic clock are very cheap. I presume these are also available in other countries?

31 March 2007, 11:53 PM	#19
astcell "TRF" Member Join Date: Aug 2006 Real Name: Robert Location: Angelus Oaks, CA Watch: 116713 Posts: 6,828	Watches with a radio receiver are getting big here in the US, they run about $30-$100 for the Casio brand ones. The hard part is setting your time zone.

1 April 2007, 01:13 AM	#21
Lol-x Facilitator Join Date: Nov 2005 Real Name: Steve Location: Omnipresent Posts: 33,587	Unfortunately in Australia there doesn't seem to be watches or clocks that are capable of atomic clock radio reception. Thanks jaycee That's a handy device Mike. I just found out that my GPS software is fixed to UTC time, but that's O.K. I can still use it to set the correct minutes and seconds on my watches :)

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