Astronomical Calculations

This page collects together some useful astronomical-related calculations I have come across.

• Sunrise/sunset (with twilight, large lookup tables)
• Sunrise/sunset (with twilight, no lookup tables)

Also available here is a Date (Calendar) Conversion program by "Peter Nave" <peter dot nave at m dot dasa dot de>. It comes with full source and one of the files is an excellent collection of procedures to do all sorts of things...

Check out:

• The NASA JPL Solar System Simulator!
• The National Optical Astronomy Observatory

Sunrise / Sunset

Sunrise / Sunset

Description:	Why write a program to calculate sunrise / sunset times when the Psion can already do it? Because I also wanted twilight times to be calculated. Juergen Galupki has written a 'front-end' to this calculation for the Siena. A small modification allows it to work on other machines too. See his web page: http://galupki.de/psion.html. New in the 1999-03-11 release: Summer time support has been added to the example (thanks to Juergen Galipki) The RISET.OPL program
Derived From:	Code written by Michael E Bakich.
Download:	sunrise1.zip (4K)
Required Modules:	None

Sunrise / Sunset

Sunrise / Sunset

Description:	Similar to above routine, this can be used to calculate sunrise/sunset times, including twilight times. However, it does not use lookup tables and is therefore smaller and (most likely) faster.
Derived From:	http://www.best.com/~williams/sunrise_sunset_algorithm.htm Almanac for Computers, 1990 published by Nautical Almanac Office United States Naval Observatory Washington, DC 20392
Download:	sunrise2.zip (2K)
Required Modules:	None

Links to other Astronomical Software

• Solun (3a, 3c, 3mx, Siena, 5, 5mx, MC218, Revo, Revo+)
• Procyon (5, 5mx, Revo, Revo+, Series 7, netBook)
• Polaris (3a, 3c, 3mx, 5, 5mx, MC218)
• SolarMap and Geoclock (3a, 3c, 3mx, 5, 5mx, MC218)