Sunrise Sunset is a Python package that can determine the sunrise and
sunset based on a given altitude zenith. It has two public methods. The
first returns the sunrise and sunset in a tuple. The second returns
True or False depending on whether the supplied date/time is during the
night or day. The constructor takes three arguments, a date, latitude,
and longitude. There is one keyword argument for changing the default
zenith, which is set to "official". The zeniths are "official", "civil",
"nautical", "amateur" (astronomical), and "astronomical". It does not
rely on third party packages, but you may need something like pytz to
create dates with timezone info.
