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    Re: Digital Watch for CN
    From: Andrew Nikitin
    Date: 2013 Nov 22, 11:55 -0800

    Not a watch, but a watch containing device:

    I am running a long-ish term study on the behavior of real time clock in wp34s calculator.

    There is a data collected so far in the bottom of the message, to show what I mean.

    I am also developing a program for it to work with the realtime clock.
    In "chronometer mode" when you press a command button it applies correction to the current value of realime clock based on todays date, rate of drift and date of last zeroing (last 2 are stored in battery backed up memory register)

    So far this correction routine works prety good: I still use the rate I determined within first week of the experiment and my corrected time is within 1 second from the UT few months later.

    Similar approach may be used with more traditional ti89, hp50, etc., but I really like wp34s's compact frame and quaint feel, so I carry it around all the time.

    Calc1 (col 1,2=date and time of observation, col3=difference from UT)

    2013-06-06 12 00 00 +0:01:01 d0
    2013-06-07 12 00 00 +0:01:02 d1
    2013-06-10 08:00:40 +0:01:06 d4.3333
    2013-06-17 09:41:53 +0:01:14 d11.4040856 ~ 1.2"/day
    2013-06-18 09:30:25 +0:01:15
    2013-06-19 09:26:03 +0:01:17
    2013-06-21 16:14:18 +0:01:19
    2013-06-25 15:47:40 +0:01:24
    2013-07-09 07:55:16 +0:01:40
    2013-07-10 11:43:08 +0:01:42 ~0.45143 + 1.19638 * x
    2013-07-11 15:57:08 +0:01:43
    2013-07-15 14:37:54 +0:01:48
    2013-07-16 13:55:11 +0:01:49
    2013-07-18 15:30:23 +0:01:52
    2013-07-22 13:14:11 +0:01:56
    2013-08-05 16:19:58 +0:02:13.9 ~0.340004 1.20379
    2013-08-08 14:13:17 +0:02:17.3
    2013-08-09 09:49:24 +0:02:18.3
    2013-08-12 15:07:02 +0:02:22.1
    2013-08-16 15:13:33 +0:02:26.8
    2013-08-20 16:28:51 +0:02:31.7
    2013-08-23 14:51:56 +0:02:35.2
    2013-09-18 13:12:46 +0:03:06.5
    2013-09-20 16:22:06 +0:03:07.0
    2013-09-24 09:28:08 +0:03:13.28 .3 .4 .3 .2 .2 m=0.28 s=0.084
    2013-09-25 09:38:40 +0:03:14.30 .4 .1 .3 .4 .3 m=0.30 s=0.122
    2013-09-26 09:16:28 +0:03:15.62 .5 .8 .7 .4 .7 m=0.62 s=0.164
    2013-10-01 13:12:25 +0:03:21.68 .7 .7 .7 .5 .8 m=0.68 s=0.110
    2013-10-02 13:09:44 +0:03:22.82 .8 1. .7 .8 .8 m=0.82 s=0.110
    2013-10-04 13:30:25 +0:03:25.20 .1 .1 .3 .4 .1 m=0.20 s=0.141 *
    2013-10-08 08:54:05 +0.03:29.78 .8 .9 .6 .9 .7 m=0.78 s=0.130
    2013-10-09 10:20:08 +0:03:30.84 .9 .8 .8 .9 .8 m=0.84 s=0.055 *
    2013-10-11 12:06:49 +0:03:33.32 .2 .3 .4 .3 .4 s=0.084
    2013-10-14 14:56:07 +0:03:37.04 .1 .1 .1 .0 .9 s=0.089
    2013-10-15 16:49:16 +0:03:38.38 .5 .4 .3 .3 .4 s=0.084

    Clock 2:
    2013-08-16 21:42:00 +0:00:00.0
    2013-08-26 08:19:09 +0:00:07.9 ~ 1.195248 s
    2013-08-27 14:22:16 +0:00:08.1
    2013-09-03 10:05:19 +0:00:13.4 ~ 0.765
    2013-09-09 13:53:10 +0:00:18
    2013-09-10 16:09:08 +0:00:18.9
    2013-09-12 08:41:06 +0:00:20.2
    2013-09-16 08:38:59 +0:00:23.1
    2013-10-16 10:54:43 +0:00:46.62 .7 .6 .6 .6 .6 s=0.045 ~0.765614
    2013-10-17 14:41:08 +0:00:47.50 .6 .4 .4 .6 .5 s=0.100
    2013-10-21 09:06:42 +0:00:50.54 .6 .6 .6 .4 .5 s=0.089
    2013-10-23 10:02:56 +0:00:52.12 .2 .1 .2 .0 .1 s=0.084
    2013-10-25 15:42:57 +0:00:53.52 .8 .5 .5 .3 .5 s=0.179
    2013-10-28 11:10:33 +0:00:56.16 .3 .1 .1 .2 .1 s=0.089
    2013-10-29 12:51:46 +0:00:56.92 .6 .8 1.0 1.1 1.1 s=0.217
    2013-11-11 16:39:41 +0:01:07.48 .7 .5 .3 .5 .4 s=0.148
    2013-11-19 15:34:05 +0:01:12.06 12.6 12.2 11.9 11.6 12.0 s=0.371

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