Ephemeris Tool 4.5 Excel

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The Ephemeris Tool gives you the ability to place a small visual ephemeris at any selected date on the chart. This is a great way of being able to quickly mark important astronomical information on your chart, without having to switch to the main ephemeris view all the time.
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ephemeris - Latin, originally from the Greek 'ephémeros, -on,' daily. An almanac of the daily motions of the planets and stars.

ephemeris.com - A website devoted to information about time and motion in the universe.

The ephemeris.com Software Library

ephemeris.com is pleased to offer Version 1.0 of the ephemeris.comsoftware library. This software reads and writes NASA'sJet Propulsion Laboratory planetary ephemeris files, andcalculates positions and velocities with the full precision ofthe original JPL software, which is written in FORTRAN.This library is written in C, and is made available for freeunder the Lesser Gnu Public License. The LGPL allows you to use thesoftware for free (but without any warranty), even if you use it insoftware you intend to sell.

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For a general overview, see the README.txt file(corrected on 28 May 2004, with correction added to distribution below).For the full terms of the Lesser Gnu Public License version 2.1, seeLICENSE.txt.

If you use this software, reference to 'The ephemeris.com Software Library'or http://www.ephemeris.com/software.htmlwould be greatly appreciated. That will help anyone interestedin finding the latest copy. Please also credit Dr. E. Myles Standishof NASA's Jet Propulsion Laboratory for the JPL ephemeris files (DE200,DE405, DE406, etc.).

The software is available as a gzipped tarball or a Winzip archive:

ephcom-1.0.tar.gz (54 kbytes)
ephcom-1.0.zip (80 kbytes)

E-mail any questions tomystars@ephemeris.com. Sendbug reports tobugs@ephemeris.com.

Known Bugs and Future Update

There is one known bug: velocities calculated in AU/second or kilometers/secondare not computed correctly because of a misplaced multiplication inephcom_get_coords(). This will be fixed in the next update. AU/day andkilometers/day report correct results. All of the example programs useAU/day.

The next update will be available 'real soon' (as of September 2004).If you would like notification when it is available, please send anemail tomystars@ephemeris.comand put 'update' somewhere in the subject of your email.

There will be one big change in the next version: the #define valuesfor EPHCOM_MERCURY and up will start at zero, not at one. Astrometricpositions will also be available, along with other routines forlocal observation.

NASA/JPL Planetary Data

The U.S. Naval Observatory uses the current JPL ephemeris, DE405, tocompute positions in The Astronomical Almanac. You can obtain a free copyof DE405 at JPL's FTP site,ftp://ssd.jpl.nasa.gov/pub/eph/export/.If you do download the data from JPL, you can test the software libraryusing DE405 by following these steps: