How to compute planetary positions (網上教材)
How to compute planetary positions, by Paul Schlyter, Sweden.http://stjarnhimlen.se/comp/ppcomp.html
Contents:
1. Introduction
2. A few words about accuracy
3. The time scale
4. The orbital elements
5. The position of the Sun
6. The position of the Moon and of the planets
7. The position in space
8. Precession
9. Perturbations of the Moon
10. Perturbations of Jupiter, Saturn and Uranus
11. Geocentric (Earth-centered) coordinates
12. Equatorial coordinates
13. The Moon's topocentric position
14. The position of Pluto
15. The elongation and physical ephemerides of the planets
16. Positions of asteroids
17. Position of comets
18. Parabolic orbits
19. Near-parabolic orbits
20. Rise and set times
21. Validity of orbital elements
22. Links to other sites
Tutorial with numerical test cases (計算例子)
http://stjarnhimlen.se/comp/tutorial.html
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