Delphic Oracle 5 Online Help

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There are 2 types of coordinate systems available in Delphic Oracle: Geocentric and Topocentric.  For the most part the difference will be so small as to be hardly noticable.  Geocentric coordinates are based upon a location as calculated from the center of the earth.  Topocentric coordinates are calculated based upon a location on the surface of the earth.  There is sometimes enough parallax between these two positions to amount to about 1 degree difference in the location of the Moon of these 2 types and you should keep this in mind when calculating lunar returns.

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