[time-nuts] To use or not to use transmission line, splitters for GPS receivers

Dan Kemppainen dan at irtelemetrics.com
Wed Oct 10 15:05:12 UTC 2012


On 10/10/2012 8:00 AM, time-nuts-request at febo.com wrote:
>> albertson.chris at gmail.com  said:
>>> >>The satellites are in 12 hour orbits.  Everything repeats every 12 hours.
>>> >>But the sun is on a 24 hr. period and if you did two 12 hour tests you don't
>>> >>want to do one at night and one in day.   So start each test at the same
>>> >>time of day let it run for 12+ hours.
>> >
>> >Thanks.
>> >
>> >After poking around a bit...
>> >
>> >That's 12 Sidereal hours rather than 12 UTC hours.
> Rarther, it's 11 hours and 58 minutes UTC.
>
> It revolves about 2x366.35 times the globe over a year. I don't remember
> why they choose such an orbit, but it has its uses.
>
> Cheers,
> Magnus

Isn't that half of a sidereal day? A sidereal day being ~4 minutes 
shorter than UTC day...




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