Lockyer, Norman, Sir, 1836-1920 · London : Macmillan and Co. · leaf 227
said in an hour. When the proper number of psalms hadbeen said, the monks were awakened.* * Arago. 192 ASTRONOMY. 400. To understand the construction of a sun-dial, letus imagine a transparent cylinder, having an opaque axis,both axis and cylinder being placed parallel to the axis ofthe earth. If… … fig. 40.—Sun-dial. (AB, axis of cylinder; MN, PQ, two Sun-dials, con-structed at different angles to the plane of the horizon, showing how theimaginary cylinder determines the hour-lines.) appear to travel round the axis of the cylinder in 24hours, and it will cast the shadow of the cylinders…
Astronomy · Solar system
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