There is an undocumented feature in PyEphem: the calculation of the parallactic angle of a heavenly body. Neither the PyEphem nor the WeeWX manual list it. I guess, few users will use it, but I was pointed to it in an issue in the Skyfield almanac extension GitHub repository. Usage is like this:
$almanac.moon.parallactic_angle The parallactic angle is defined as the angle between two great circles: the circle through the body and the zenith and the circle through the body and the celestial poles. Now, the Skyfield almanac extension <https://github.com/roe-dl/weewx-skyfield-almanac> includes this attribute, too. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/weewx-user/e2159177-fdf3-42e2-843a-0c0f1d6855f3n%40googlegroups.com.
