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# Planetary Hours library for Arduino This library uses the `sun_rise()` and `sun_set()` functions from the [avr-libc time.h](http://www.nongnu.org/avr-libc/user-manual/group__avr__time.html) library to calculate planetary hours. For more information on planetary hours, check out these resources: - http://www.renaissanceastrology.com/planetaryhoursarticle.html - http://www.esotericarchives.com/agrippa/agripp2c.htm#chap34 The planets themselves are represented numerically from 0 to 6 based on the Chaldean order, like this: ```c++ #define SATURN 0 #define JUPITER 1 #define MARS 2 #define SUN 3 #define VENUS 4 #define MERCURY 5 #define MOON 6 ```