Markpointer 57
https://sites.google.com/view/a-markpointer/57
56,98427250 Global-600-units between 18-18 and Stonehenge
56,99639897 Global-360-units between Ur-13,774 and Tunguska
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Sun's Galactic rotation period:
13,77 / 56,98486297 = 0,241643118 (241,643 million years)