I'm not sure your friend needs the time at all. Telescope tracking
mounts have a periodic error due to non-perfect mechanical parts. The
usual way to remove this error is to "train" the mount by manually
guiding it through one or more periods, or - probably more common these
days - use an optical autoguider.
Jim
On 1:59 PM, Brooke Clarke wrote:
Hi Brian:
Why? Do you just want to see the sidereal time on a display or do you
need a digital output?
The Spark Fun "serial enabled" displays use what's called a "back
pack" that has the PIC 16F88 uC and it's used to do serial data to LCD
parallel data can control lines. I've made some clocks using that chip.
http://www.prc68.com/I/PIC16F88.shtml
http://www.prc68.com/I/PRC68COM.shtml#07092006
A friend is setting up an observatory where the pointing accuracy of
the telescope mount is specified as " 7 arcseconds or less
peak-to-peak periodic error before correction". Much better after
correction. That implies he needs to know what time it is within tens
of milliseconds.
http://www.prc68.com/I/StellarTime.shtml#StrMov
We looked into different ways to get the time into his computer to
that accuracy and NTP looks like it will fill the bill, so a GPS
receiver may not be required.
Have Fun,
Brooke Clarke
http://www.PRC68.com
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
