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(HP-67) Sun Pointing Programs & their Accuracy
04-21-2019, 08:39 PM
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(HP-67) Sun Pointing Programs & their Accuracy
An extract from Sun Pointing Programs and their Accuracy, Sandia National Laboratories, SAND81-0761, MAY 1981 (90 pgs)

This paper describes several sun-pointing programs and their accuracy. FORTRAN program listings are given. Program descriptions are given for both Hewlett-Packard (HP-67) and Texas Instruments (TI-59) hand-held calculators
Where is the sun? Anyone can point to the sun on a clear day, but to predict with any accuracy the sun's location at some future time (hours, days, years from now) is a difficult task. Renewed interest in solar energy has stimulated development of new sun-pointing programs. A large number of these programs are available, with varying claims of accuracy. This document reviews several sun-pointing programs, reports on their accuracy, and provides detailed programming instructions. In several instances, the programs are adaptable to hand-held, programmable calculators, and, in these instances, the program instructions for both Hewlett-Packard and Texas Instruments products are given.


APPENDIX E--HP-67 Version of the SUNAEP Program
APPENDIX F--HP-67 Program for the Correction of the Sun's Elevation Angle Due to Atmospheric Refraction

APPENDIX I--HP-67 Program for the Converison of the Sun's Azimuth-Elevation Coordinates to Its Polar-Declination Coordinates and the Inverse

APPENDIX K--HP-67 Program for the Computation of Collector Trough Tracking and Incidence Angles

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