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This program demonstrates how to interact with a PPL subroutine that calculates the osculating classical orbital elements of the Moon in the mean ecliptic and mean equinox of date coordinate system. This algorithm is based on the book Lunar Tables and Programs From 4000 B.C. TO A.D. 8000 by Michelle Chapront-Touze and Jean Chapront.

The user can provide a UTC date of interest starting at line 48 of the source code as follows

// utc calendar date

month := 1;

day := 1;

year := 1990;

The zipped archive, demo_elp.zip, for this program can be downloaded from

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