[544] in SIPB_Linux_Development
sdate
daemon@ATHENA.MIT.EDU (Daniel J. Thumim)
Wed Apr 6 22:56:11 1994
To: linux-dev@MIT.EDU
Date: Wed, 06 Apr 1994 22:55:55 -0400
From: "Daniel J. Thumim" <dthumim@MIT.EDU>
I see that /mit/sipb/linuxbin/sdate now exists. Unfortunately, it doesn't
work. The first problem is with time zones. On my system, the TZ
environment variable is not set (before you flame me, read this whole
message), the timezone is set by /usr/lib/zoneinfo/localtime (and
posixrules which is a link to it).
All the runs of sdate below were run within 3 seconds of each other.
Note that I'm assuming that sdate works correctly on the DEC, flame me
now if that's not so. Here is the output of sdate on a DECstation:
Thu Apr 7 02:43:05 1994 GMT
02:44:08 Terrestrial Dynamical Time
Wed Apr 6 22:43:05 1994 Local Civil Time
21:58:42 Local Mean Time
The Moon is 3.7 days past Last Quarter
Julian Day 2449449.613
14:43:41 Greenwich Mean Sidereal Time
09:59:17 Local Sidereal Time
20:56:23 L.H.A. of Sun
6.701 Degrees Declination
Azimuth 322.242 Degrees
Elevation -33.586 Degrees
Sunrise 06:19 Tomorrow 06:17
Sunset 19:16 Tomorrow 19:17
Moonrise 03:58 Tomorrow 04:26
Moonset 15:22 Tomorrow 16:21
And on linux:
Wed Apr 6 21:43:08 1994 GMT
21:44:11 Terrestrial Dynamical Time
Wed Apr 6 22:43:08 1994 Local Civil Time
16:58:45 Local Mean Time
The Moon is 3.7 days past Last Quarter
Julian Day 2449449.613
09:43:44 Greenwich Mean Sidereal Time
04:59:20 Local Sidereal Time
15:56:26 L.H.A. of Sun
6.701 Degrees Declination
Azimuth 322.255 Degrees
Elevation -33.591 Degrees
Sunrise 06:17 Tomorrow 06:15
Sunset 19:17 Tomorrow 19:18
Moonrise 04:26 Tomorrow 04:52
Moonset 16:21 Tomorrow 17:20
Here you can see that GMT is not calculated correctly. The times listed
for sun/moon rise/set are all tomorrow's times. So maybe fixing the GMT
bug will fix that one. But maybe not... here is what happens on linux
with (export TZ=EDT;/mit/sipb/linuxbin/sdate):
Thu Apr 7 02:43:08 1994 GMT
02:44:11 Terrestrial Dynamical Time
Thu Apr 7 02:43:08 1994 Local Civil Time
21:58:45 Local Mean Time
The Moon is 3.7 days past Last Quarter
Julian Day 2449449.613
15:43:44 Greenwich Mean Sidereal Time
10:59:20 Local Sidereal Time
21:56:26 L.H.A. of Sun
6.701 Degrees Declination
Azimuth 322.255 Degrees
Elevation -33.591 Degrees
Sunrise 10:17 Tomorrow 10:15
Sunset 23:17 Tomorrow 23:18
Moonrise 08:26 Tomorrow 08:52
Moonset 20:21 Tomorrow 21:20
Now it gets GMT right, but local civil time wrong, and the sun/moon rise/set
times are all screwed up. Anyway, that's what I've found, I hope it's
enough info for someone to fix it. (By the way, who compiled it?) Thanks,
-- |)an
