A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 78
diagram, let H H represent thehorizon, P P the axis of the celestialsphere, E E the equinoctial; let also Sbe the sun in north declination, and Sin south declination ; it will be obviousthat as the earth turns, the sun at S willappear to move in a diurnal arc, as a S 5,greater than the nocturnal… … LONGEST DAY AND NIGHT, Questions.—108. What causes the succession of day and night ? 109. On what doesthe length of day and night depend ? How does the day compare with the night whenthe sun is north of the equinoctial ? When south of it ? Explain by the diagram. 74 DAY AND NIGHT. 110. All places…
Astronomy
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