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Sun, Moon and Earth

47 47 46 Stonehenge the oldest known calendar The basic 28hole model shown on the previous page may be improved to include eclipse prediction. By doubling the number of postholes to 56 we exploit the useful coincidence of there being almost exactly 3 cycles of the lunar nodes in twice 28 years. The lunar nodes are here shown as two diametrically opposed triangular markers, initally placed near to the datepositions where eclipses have been recently observed. The Sunpole now moves 2 holes anticlockwise every thirteen days, and the Moonpole 2 holes anticlockwise every day. The node marker is moved 3 holes clockwise every year. When the Sun pole lies within three holes of a nodepole, an eclipse of some sort will take place at each full or new moon, although it may not be visible at the location. If at each new moon the moonpole is made to skip past the Sunpole omitting this hole, this calendar will run for at least a year before the Moonpole needs resetting easiest to do at full Moon. Remarkably, this design is to be found hidden within the plan of Stonehenge, which can indicate the date season, Moon position and phase, and predict full and new moons and eclipses. The Aubrey circle 3000 BC comprises 56 holes, accurately arranged round the perimeter of a 283 foot diameter circle, predating the erection of the famous massive inner Sarsen circle. Perhaps posts were once placed in these holes now they are filled with concrete, but this oldest known calendar would still work today.
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