Input location and date, check and amend daylight saving (summer time)
near its start and end as it is approximate, then calculation is automatic
- National Oceanic and Atmospheric Administration (NOAA) improved sunrise-sunset calculation (website) based on Astronomical Algorithms by Jean Meeus.
- Keith Burnett sun & moon rise / set project (website) based on routines from Astronomy on the Computer 2nd English edition, especially section 3.8, by Montenbruck & Pfleger.
- Peter Hayes sun calculations based on sci.astro FAQ by Paul Schlyter (not used) and moon calculations (website gone) based on Astronomical Algorithms by Jean Meeus (moon rise / set / phase) and Basic Sky & Telescope, March 1985 (new / full moon).
- Muskegon Astronomical Society moon rise & set computation (website) from Sky & Telescope, July 1989.