American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 119
Vernal Equinox over the mean sun forthe angle through which the mean sun has traveledfrom the Greenwich meridian. ^The mean sun is tothe eastward of the Vernal Equinox by the amountof its right ascension. We therefore lay off PV,the hour circle of the Vernal Equinox, so that thearc VSm equals the… … FIG. 39. Draw a circle to represent the plane of the celestial equator. Project the pole P and the local meridian JPQ. Draw the arrow pointed west to show thedirection in which the hour circles move. Since the longitude is east, we know thatthe Greenwich meridian is to the westward of the local…
Navigation · Nautical astronomy
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