Lego orrery with the Sun, the Earth and the Moon

This orrery, made by marian from Lego, models the movements of the Sun, Earth and Moon with accurate rotational and orbital periods, axial tilts and lunar precession (the inclination of the moon's orbit is "exaggerated to make it noticeable"). There are two cranks to operate it and even a 12-sided stand representing the Zodiac. — Read the rest

from Boing Boing https://ift.tt/3B1oRtC
via IFTTT

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