Jacoby, Harold, 1865-1932 · New York, The Macmillan company · leaf 297
rotation, and to bring about a consequent minute lengthening of the terrestrial day, after the lapse of sufficient ages of time. But the most delicate astronomic observations have failed to detect any such lengthening of the day. It must therefore be extremely small, certainly not more than to… … , _ Fig. 66. Tidal Effect on the Moon. under the moon. But so much of the tidal effect as acts like friction, to retard the terrestrial rotation, must also make the two protuber- ances lag behind their proper positions at A and B. This brings H nearer the moon than W ; increases the lunar…
Astronomy
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-335-226.webp)
