https://github.com/variar/elp2000-82b

Implementation of the ELP theory version ELP 2000-82B in C
https://github.com/variar/elp2000-82b

Last synced: 8 months ago
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Implementation of the ELP theory version ELP 2000-82B in C

• Host: GitHub
• URL: https://github.com/variar/elp2000-82b
• Owner: variar
• Created: 2013-03-22T04:06:36.000Z (about 13 years ago)
• Default Branch: master
• Last Pushed: 2019-09-16T09:17:00.000Z (over 6 years ago)
• Last Synced: 2025-07-13T15:43:12.308Z (11 months ago)
• Language: Objective-C
• Homepage:
• Size: 821 KB
• Stars: 17
• Watchers: 3
• Forks: 6
• Open Issues: 0
• Metadata Files:
  • Readme: README.markdown

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README

          
ELP2000-82B

===========

This library provides functionality to compute lunar positions and thus allowing contruction of lunar ephemerides.

It is based on semi-analytical **theory ELP version ELP 2000-82B** developed by **M. Chapront-Touzé** and **J. Chapront**

at Bureau des Longitudes, Paris, France.

To find information on the theory itself, refer to the following original papers:

1. M. Chapront-Touzé and J. Chapront. The lunar ephemeris ELP 2000. Astronomy and Astrophysics, vol. 124, 1983,

   pp. 50-62.

2. M. Chapront-Touzé and J. Chapront. ELP 2000-85: a semi-analytical lunar ephemeris adequate for historical times.

   Astronomy and Astrophysics, vol. 190, 1988, pp. 342-352.

3. Lunar Solution ELP 2000-82B. Explanatory note.

4. J. Chapront and G. Francou. The lunar theory ELP revisited. Introduction of new planetary perturbations.

   Astronomy and Astrophysics, vol. 404, 2003, pp. 735-742.

   

As well as data files found through [Vizier Catalog FTP service](http://vizier.cfa.harvard.edu/viz-bin/ftp-index?VI/79).

![ELP2000-82B logo][1]

This library is implemented in C and needs be linked only against math library.

Provided files contain the following functionality

* **elp2000-82b** is the main file of interest. It contains routines that compute lunar positions depending on desired

  output coordinates and reference frame. Refer to the header comments for more information.

* **arguments** contains routines that compute arguments of the ELP theory. Among such, this file contains a routine

  to compute mean lunar arguments (Delaunay arguments), that may come in need while performing various lunar

  computations.

* **series** contains auxiliary routines that compute Fourier and Poisson series of the ELP theory.

* All other header files define arrays of coefficients of ELP theory and are of no practical use outside given library.




**If you find any errors or inconsistencies with this software, please contact me via [e-mail][2]**




Serhii Tsyba

18.08.2010


Helsinki, Finland

[1]: https://dl.dropbox.com/u/4936034/Referred/ELP2000-82B.png          "ELP2000-82B logo"

[2]: mailto:sertsy@gmail.com                                            "Contact e-mail"