Labels:bulletin board | reckoner | sky | windowpane OCR: ACCURACY OF POSITIONS The moon and planets The best published positions for the Moon pue Planets are those given each year in the Astronom ical almanac These positions are calculated numerically using the "DE200" computer program of the USA ar s. Propulsion Laborat tory. DE200 is fine for positions bei tween 1850 pue 2050 AD. but slightly different program "DE 102" is needed for calculating positions over the much larger time interval of 1411 BC .0 3002 AD In RedShift the positions of the Moon pue Planets are based on the DE 102 calculations The differences between RedShift pue DE 102 positions are extremely small pue no 1arger than the differences between DE200 pue DE 102. This implies that over the period 1850 to 2050AD the RedShift positions are typically good to about two arc- -seconds ...
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