Is the sun up in Columbus? Using PyEphem to figure it out

is_the_sun_up.py

import ephem

def is_the_sun_up():
    columbus = ephem.city('Columbus')
    sun = ephem.Sun()
    columbus.pressure = 0
    sun.compute(columbus)
    twilight = -6 * ephem.degree
    return sun.alt > twilight

# Civil Twilight is defined as ending / beginning when the sun is 6 degrees below the horizon.
# Setting the pressure to 0 is to turn off atmospheric scattering calculations
#
# http://rhodesmill.org/pyephem/
# http://rhodesmill.org/pyephem/rise-set.html
# https://stackoverflow.com/questions/2637293/calculating-dawn-and-sunset-times-using-pyephem
# https://stackoverflow.com/questions/26501745/how-to-determine-if-it-is-daytime-light-outside-in-python-using-ephem-library