Labels:bulletin board | reckoner | sky | windowpane OCR: ACCURACY OF POSITUONS The moon and planets The best published posit ions for the Moon and Planets aue those given each year in the Ast tronomical almanac These positions are cal 1culated numer ically using the "DE200" computer program of the USA s Jet Propulsion abora1 tory DE200 is fine for positions bei tween 1850 pue 2050 AD but s1i ightly different program "DE 102 is needed for calculating posit ions over the much 1arger time interval of 1411 BC to 3002 AD In RedShift the positions of the Moon and Planets are based on the DE 102 calculations The differences between RedShift pue DE 102 positi ions are extremely small pue no larger than the diff erences between DE200 pue DE 102 This implies that over the period 1850 to 2050AD the RedShift positions are typically good to about two arc- -s ...
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