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Updated: October 9, 2026
And precisely this circulatory process it is which gives to our great luminary its permance as a sun, or warming and illuminating body. Both Galileo and Scheiner spoke of the apparent or "synodical" period, which is about one and a third days longer than the true or "sidereal" one. Am. Ass. Meteor. dell Osservatorio dell Coll. Roy. Jour. of Science, 1881, vol. xxi., p. 41.