🚀 go-pugleaf

In article <1990Dec12.214854.19076@swbatl.sbc.com> ken@swbatl.sbc.com (Ken Gianino 5-9081) writes:
>In article <1833@umriscc.isc.umr.edu> robf@mcs213j.cs.umr.edu (Rob Fugina) writes:
>>My roommate just asked me to design a clock for him.  It's for astronomical
>>purposes.  Relatively simple, really, but I need a little advice and some
>>chip numbers.
>>
>>The clock has to count from 00:00:00 to 23:56:03, then reset back to zero.
>
> Why 23:56:03?   Doesn't sidereal time use 24 hours and just lose 4 min/day?

I'm glad someone caught this. Sidereal time is indeed at 24 thing, it's just
that the hours are slightly shorter - 1.002737909 times shorter (23h 56m
4.09053s to the sidereal day). You just need to design a normal 24 hour clock
that uses a clock frequency shifted up by this amount. Very vague
recollections say that someone actually made 1.002738 MHz crystals, but I have
no idea who. Good luck.

--
  Mike Ressler - Infrared Photon Jockey     ressler@galileo.ifa.hawaii.edu

  If at first you don't succeed, get a bigger sledgehammer.