[time-nuts] Lady Heather calendar functions

[Magnus Danielson]

On 05/01/2011 04:08 PM, Brooke Clarke wrote:
> Hi John:
>
> Are you the one to ask about an optional plot?
> The GPS satellite orbits are based on sidereal time so that they have
> repeating ground tracks.

Not quite. The pattern does not perfectly meat up on orbit-for-orbit if 
you plot it on earth.

> If the satellite in view plot was in sidereal time then for a fixed
> antenna position the plots would not change.

It will shift slightly for every orbit. It takes a year to match up.

Cheers,
Magnus

> This might allow a better way of selecting which satellites the receiver
> uses.
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
>
>
> John Miles wrote:
>>> Yes, Lady Heather has some rather extensive calendar functions
>>> built in, including a list of common (and not so common)
>>> holidays. If the file heather.cal is found, it uses that file
>>> for the holidays... you can add your own or delete some. Otherwise it
>>> uses the built in list. I don't think John's
>>> latest distribution has the .CAL file...
>> Yep, it's there.
>>
>> Parenthetically, the TCP test-mule Thunderbolt will be down for a few
>> days,
>> in case anyone tries to access it. Should be back up by Thursday night.
>>
>> -- john, KE5FX
>>
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>>
>>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.