Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 148
practicalastronomy, descriptions of which do not fall within thescope of this work. For convenience of reference, we reca-pitulate the elements of a planets orbit: 1°. The heliocentric longitude of the ascending node ; 2°. The inclination of the plane of the orbit to that ofthe ecliptic; THE SUN… … Fig. 63. Kelative sizes of the suns disk as seen from the different planets. The Suns Angular Diameter. 114. The angle subtended by the sun may be measureddirectly by means of a micrometer, or its value may be de- 144 ASTRONOMY. duced from the observed time that it takes the suns diskto cross the…
Astronomy
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