Polar Precession / Polar Obliquity Calculator

Price: $10.00
Shareware download

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A spreadsheet program that Paul LaViolette has written for use with Microsoft Excel®. Calculates the ecliptic longitude position of the vernal equinox for arbitrary dates in the past. It also calculates the corresponding angle of polar obliquity (the inclination of the Earth’s pole to the ecliptic). The program uses a mathematical expansion taken from astrometer Andre Berger’s 1977 and 1978 publications.

Click here to download the Polar Precession calculator (Excel 2013 Format)