(TI-59) Skywatchers of Ancient Mexico

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An excerpt from Skywatchers of Ancient Mexico, Appendix F. Archaeoastronomy Computer Programs for a Portable programmable Calculator, pages 120 - 128, 1980.

    In order to aid investigations pursuing studies of building alignment and calendar, I am making available two programs written specifically for a Texas Instruments (TI-59) Programmable Calculator. The programs, written by Matthew Iatridis of the Colgate University Computer Center, are easily adaptable to most programmable calculators.
    The following programs are documented: (a) an "azimuth finder" for use with a surveyor's transit [excellent for field study], allowing one to obtain immediately the correct azimuth and altitude of the sun as well as the true azimuth of any alignment, and (b) an azimuth or declination predictor for sun, stars, and moon.

Azimuth Finder Program for TI-59 Calculator
Program Description
Azimuth finder for use with surveyor's transit. Program will return the correct azimuth and altitude of the sun for any given time or place as well as the azimuth of any alignment. …
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User Instructions
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Coding Form…
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Azimuth-Declination Predictor for TI-59 Calculator
Program Description
Azimuth-declination predictor for stars, sun, and moon. …
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Given dec, LAT, and ALT one can find azimuth or given LAT, ALT, and AZ one can find declination. …
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User Instructions
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Coding Form
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Note: The following data [REF] must be loaded into data registers 10-20:
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BEST!
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