Primary Directions – a question about the source of an image


I was recently looking though some files on my computer and came across a useful graphic that explains the semi-arc method of primary directions.  I must have downloaded this file from the internet some years ago but I don’t remember the source.  If any reader recognizes it, please let me know.  Here is the image:

Diurnal semi-arc method of primary direction -- source of image unknown.

Diurnal semi-arc method of primary direction — source of image unknown.

The was another image illustrating the difference between a solar and a sidereal day, but I found the source for it at http://csep10.phys.utk.edu/astr161/lect/time/timekeeping.html

Sidereal and Solar Days

Sidereal and Solar Days

This image is from a well-done astronomy course from the University of Tennessee.

About Anthony Louis

Author of books about astrology and tarot, including TAROT PLAIN AND SIMPLE, HORARY ASTROLOGY, and THE ART OF FORECASTING WITH SOLAR RETURNS.
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