[time-nuts] Sidereal time

Bob Camp lists at cq.nu
Fri Jan 15 17:33:51 UTC 2010


Hi

Ok, so NTP is indeed "good enough" for the application. Each millisecond
bumps you a half meter...

Grab a beater PC or Soekris board and write some code.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Lux, Jim (337C)
Sent: Friday, January 15, 2010 12:22 PM
To: jfor at quik.com; Discussion of precise time and frequencymeasurement
Subject: Re: [time-nuts] Sidereal time




On 1/15/10 9:13 AM, "J. Forster" <jfor at quik.com> wrote:

> Heresy:
> 
> Why do you really NEED super accurate siderial time? If you are using it
> to point a telescope, you only need it accurate enough to get the guide
> stars into the field. Remember, the atmosphere refracts kinda randomly.
> 
> -John
> 
> =

Celestial Navigation?  Essentially, one determines longitude by figuring out
what the difference between local solar time and sidereal time is. Now, what
is super accurate?  40,000 km =24hrs, so 1 second is about 460 meters.  


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