If you look at this link they have days realting to right acension.
How did they calculate nov 20th == 0h, dec 6 == 1h?
I was trying to calculate this in astropy, but I end up with nov 20th, 8pm == 22h.
from astropy import units as u from astropy.time import Time from astropy.coordinates import SkyCoord, EarthLocation, AltAz time_str = "2017-11-20 20:00" #Greenville SC, eclipse just went through there. LON = -82.3940 LAT = 34.8526 loc = EarthLocation(lat=LAT*u.deg, lon=LON*u.deg, height=0*u.m) utcoffset = -4*u.hour # Eastern Daylight Time obstime = Time(time_str,scale='utc') - utcoffset cord = SkyCoord(alt=90*u.degree,az=0*u.degree,obstime=obstime,frame = 'altaz',location = loc) print obstime,cord.fk5.ra.hour, cord.fk5.dec.deg >> 2017-11-21 00:00:00.000 22.505946538 34.7569396915