astronomy

  1. N

    Help calculating planetary postions

    I am searching help to make an excel table that will calculate planetary positions with hourly precision. I need something similar to the printscreen bellow. Input for: start date, number of days, planets, geo or helio. The result first big column: first planet (Sun), second column (Moon), third...
  2. H

    Speed of worksheet functions

    why does worksheetfunction.acos(c) take about 10 times the time of the atn( sqr(1-c*c)/c)) method :eeek::eeek:
  3. A

    Swiss Ephemeris in Excel using vba

    Hi all Shortly: I want the swiss ephemeris (mainly longitudes of sun and moon) from 1900 A.D. to 2014 A.D. in excel. Clearly: I have downloaded a software from nasa swiwin32.zip which is free ( by going through this link Index of /ftp/swisseph/programs) and when i run the software i enter my...
  4. H

    Astronomy functions as class modules

    Need some modern Excel functions for science students and astronomy. On www there are a multitude of UDF that calculate astronomical values. Most of these use an index and repeat the same pre calculation three times to get information like x y z or radius theta phi ... and repeat the same 3...

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