![]() Skyglobe's dates use the Julian calendar until Octoand the Gregorian calendar thereafter. ![]() ![]() Skyglobe accounts for the earth's precession in its calculations and should therefore be accurate to tens of thousands of years in the past and the future, but its manual does warn that the positions of planets might not be accurate throughout this range (it says "their coordinates are approximately correct for as far back and forward as we have data").
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