Accession Number : ADA263156


Title :   LIGHTPC Accuracy Study.


Descriptive Note : Project rept.


Corporate Author : AIR FORCE ENVIRONMENTAL TECHNICAL APPLICATIONS CENTER SCOTT AFB IL


Personal Author(s) : Peterson, Matthew C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263156.pdf


Report Date : Dec 1992


Pagination or Media Count : 49


Abstract : This report documents the results of a USAFETAC study of the accuracy of LIGHTPC and ICE PC small computer programs, both of which were used to compute astronomical data such as sunrise, sunset, moonrise, and moonset. It presents error distributions for programs at and above 60 deg N. The LIGHTPC program solves fundamental astronomical equations to produce sunrise and sunset times; the ICE program allows accesses to an ephemeris calculated to high precision. The LIGHTPC program is less accurate than ICE in precision. The LIGHTPC program is less accurate than ICE in predicting sunrise and sunset times at all latitudes above 60 deg N. The report discusses weaknesses of the LIGHTPC program and errors in the ICE program. Techniques for using LIGHTPC to correct ICE to produce better sunrise, sunset, twilight end and twilight start, times than by using ICE alone are provided.... Computers, Computing, Personal computers, Microcomputers, Computer programs, Astronomy, LIGHTPC, SUNSET, Sunrise, Twilight, Moonrise, Moonset, Error distributions, Computer programs, Verification, Software(computers), Accuracy, Comparison.


Descriptors :   *COMPUTER PROGRAMS , *SUNSET , *MOON , *SUNRISE , VERIFICATION , COMPARISON , ACCURACY , TWILIGHT , LATITUDE , ERRORS , PRECISION , ASTRONOMY , MICROCOMPUTERS


Subject Categories : Astronomy
      Computer Programming and Software


Distribution Statement : APPROVED FOR PUBLIC RELEASE