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The Relation of Human Affairs to the Number of Hours
Relationship of Human Affairs to the Apparent Daily
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21 and September angle antarctic circle apparent declination apparent path approximately arctic circle astronomical twilight average celestial equator circle of illumination clock computed darkness December 22 distance in degrees due east due west duration of daylight earth east and sets fact farther Greenwich high latitudes horizon 24 hours horizon at midnight horizon at noon horizon horizon horizon horizon plane hours of daylight January July June 21 length light longitude maps March 21 miles months noon altitude noon-sun north pole northern hemisphere number of days number of hours o'clock observer overhead at noon parallel of latitude place of sunrise prime meridian refraction rotation season September 23 south of east south pole southern horizon southern sky star summer sun at noon sun is overhead sun rises sun-behavior sunbeam sunrise and sunset temperature tropic of Cancer tropic of Capricorn tude twenty-four hours twilight vertical ray winter zenith at noon zenith distance zone