suncal.py

# The below is a tiny example using 'astral', a Python module which calculates sun and moon event times.
# see its documentation at http://pythonhosted.org/astral/ . This example calculates the length of a day
# for 12/2016, at San Luis Obispo, CA, elevation 100.

# `pip install astral` will install the dependency

from astral import *
from datetime import date

a = Astral()
location = Location(info = ('San Luis Obispo', 'California', 35.27873, -120.65792, 'America/Los_Angeles', 100))
location.timezone = 'America/Los_Angeles'

print('Information for %s' % location.name)
timezone = location.timezone
print('Timezone: %s' % timezone)
print('Latitude: %.02f; Longitude: %.02f' % (location.latitude, location.longitude))
print

year = 2016
for month in [12]:
	for day in range(1,32):
		sun = location.sun(local=True, date=date(year, month, day))
		sunrise = sun['sunrise']
		sunset = sun['sunset']
		daylength = sunset - sunrise
		print('%d/%d/%d\tSunrise: %s\tSunset: %s\tDay Length: %s' % (
			month, day, year, sunrise.strftime('%X'), sunset.strftime('%X'), daylength))