• Document: UNITED STATES NAVAL OBSERVATORY CIRCULAR NO Computer Programs for Sun and Moon Illuminance. With Contingent Tables and Diagrams
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mm UTIC FILE CÜÖ 0 UNITED STATES NAVAL OBSERVATORY CM 00 CIRCULAR NO. 171 < I U. S. Naval Observafcwy. Washington, D. C. 20392 February 19,1987 Q < Computer Programs for Sun and Moon Illuminance With Contingent Tables and Diagrams by P. M. Janiczek and J. A. DeYoung DTIO ELECTE JUN181987 DISTRIBUTION ■ >' STATEMENT .in A Approved lot public xelaoaal Diitribution Unlimited S7 6 16 02 - Computer Programs for Sun and Moon Illuminance With Contingent Tables and Diagrams by P. M. Janiczek and J. A. DeYoung Nautical Almanac Office * U. S. Naval Observatory Washington, D. C. I" CONTENTS Introduction Section: I Description of Terms 3 II Computer Programs 10 The FORTRAN Program 16 The BASIC Program for Computers 25 The BASIC Routine for Programmable Calculator 33 III Contingent Tables and Diagrams 40 Table 1 -- Sun Meridian Passage Increment and Declination 50 Table 2 52 Table 3 - Longitude, Time Adjustments 69 Altitude, Azimuth Diagr. ns 70 Sun Illuminance Diagram 103 Moon Illuminance Diagrams 104 i Appendices: Accesion for Geographic Coordinates NTIS CRA&I 106 DTIC TAB D Unannounced G B Illuminance Justification 129 By _ Distribution/ Availability Odes Avail at d | Of Dist bpccial h V INTRODUCTION There is an ever increasing need for .quantitative information concerning everyday astronomical events as they affect the range of private, civil and military activities. The information most needed is usually one or a combination of the following: 1. rise and set times of the Sun and Moon, 2. beginning and ending times of twilight, 3. total number of daylight hours, 4. maximum height of the Sun or Moon above the horizon with corresponding time of occurrence, 5. at specific instants, the angular distance of the Sun or Moon from the horizon and from a cardinal direction, 6. the amount of natural light at a designated time of day or night., These data not only may differ from day to day (continuously in the case of 5. and 6.), but also differ appreciably as experienced at one place on the Earth as opposed to another, even at the same instant. Despite the calculational complexities mplied, it is possible not only to satisfy the needs for all such data in a straightforward way, but also to piace appropriate tools for producing the data directly into the hands of those who need it. This publication is intended for a large number of people who have requirements for the type of data listed, but whose education has placed no special emphasis on astronomy. In what follows there are the means for calculating the needed information either by one of the self-contained computer routin

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