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From: squishy@casbah.acns.nwu.edu (Shishin Yamada)
Newsgroups: sci.electronics
Subject: Re: Sidereal Time Clock
Summary: Skip 60Hz frequency to obtain sideral time.
Keywords: Sideral Time Clock, Clock
Message-ID: <27644.277c4202@kuhub.cc.ukans.edu>
Date: 29 Dec 90 13:13:05 GMT
Lines: 43


     On a side-note, if you might try modifying the clock frequency by
Message-ID: <2369@casbah.acns.nwu.edu>
Date: 29 Dec 90 12:06:30 GMT
References: <1833@umriscc.isc.umr.edu> <3023@lamont.ldgo.columbia.edu> <4391@alliant.Alliant.COM>
Followup-To: 4391@alliant.Alliant.COM
Distribution: sci.electronics
Organization: Northwestern University
Lines: 35

"missing beats," that is, every nth oscillation, skip the clock's
increment. On a 24h:00m:00s normal day, there are 86,400 seconds. If the
clock counted by using the 60Hz line, this makes 5,184,000 beats. On a
23h:56m:00s sideral day (24 normal hours to us), there are 86,160 seconds.
This makes for 5,169,600 beats on a 60Hz line.
     Therefore, if you skipped a beat every 14,400 beats of a 60Hz line,
your clock would then count sideral time.  In this manner, you could have a 
counter that went up to 14,400 beats, and then have it blank the next
(14,401th beat) of the 60Hz line. This correction would occur every 240
seconds (4 minutes). This introduces a very small error into your clock,
since the 240th second will be 59/60th of a normal second, but not much as
it corrects itself every four minutes. Pretty accurate, I think.
It's a weird idea, but then again, I just thought of it! Hope you like it!
     If you'd like more of my  weird ideas, please e-mail me on BitNet. I
am fastest to reply on that medium!
======================================================================
Shishin "SQUISH" Yamada        | BitNet: squishy@casbah.acns.nwu.edu
Senior Undergraduate, EE       | Compuserve: 76636,3254
Northwestern University        | Prodigy: KTVB99A
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Newsgroups: sci.electronics
Subject: Re: Sidereal Time Clock
Summary: 
Expires: 
References: <1833@umriscc.isc.umr.edu> <3023@lamont.ldgo.columbia.edu> <4391@alliant.Alliant.COM>
Sender: 
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Distribution: sci.electronics
Organization: Northwestern University
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