Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 57
ay, the Sun then being above the celestialequator. This is represented in a different manner in Fig. 18 :A is any point in the northern hemisphere which has the Sun onits meridian, AS the direction to the Sun. 0 is the centre ofthe earth, so that OA is the direction of the zenith &% A. Inwinter… … Summer VernalEquinox Fig. 17.- -The Inclination of the Earths Axisto Ecliptic. THE EARTH IN RELATION TO THE SUN 45 Now when a given area is exposed to heat coming from adistant source the amount of heat falling upon it will vary withthe inclination of the area to the direction of the source.…
Astronomy
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