Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 223
on this line, whichwe mark XII. When the Sun has advanced 15° to thewest, the shadow will be thrown on the next line to theeast, which we mark I., and so on. The distance of theSun above the equator will evidently make no differencein the lateral direction of the shadow. 387. In practice, however,… … Fig. 86.—Sun-dial. A B, axis of cylinder; J/2V, P Q, twodials, at different angles to the plane of the horizon,showing how the imaginary cylinder determines thehour-lines. device for measuring time did King Alfred resort ? 380. Explain the construc-tion of the sun-dial. 387. Do we really need a…
Astronomy
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