#  Copyright and Sources of Reference Materials

### Van_Flandern_&_Pulkkinen-1979.pdf

### LOW-PRECISION FORMULAE FOR PLANETARY POSITIONS
Written by T. C. Van Flandern and K. F. Pulkkinen
US Naval Observatory, Washington DC
Copyright 1979 The American Astronomical Society

Available as of February 2026 at
 https://adsabs.harvard.edu/full/1979ApJS...41..391V
 
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### sunup.bas
Published by Sky & Telescope, written by Roger W. Sinnott

Available as of February 2026 at
https://www.skyandtelescope.com/wp-content/uploads/sunup.bas

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### Sky_And_Telescope_sunrise-sunset.pdf

### Astronomical Computing, edited by Roger W. Sinnott
#### Sunrise and Sunset: A Challenge

From the August, 1994 issue of Sky & Telescope, page 84-85
Copyright 1994 Sky Publishing Corp.

As this article has become almost impossible to find online, it is included here for scholarship, research, and nonprofit educational purposes.

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### script_sun_rise_set2.html and standard.css
Stephen R. Schmitt's javascript code may be found scattered throughout the Internet.
Copyright 2007, Stephen R. Schmitt
