Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 65
differencein the right ascensions of the two Suns and therefore the equa-tion of time. It is easily seen that if Si precedes Q, the equationof time will be negative ; if it follows it, it will be positive.Now tS = tSi and since tSQ is a right-angled sphericaltriangle, tSis greater than tQ,provided… … Fig. 22.- is negative. Simi-larly it is positivebetween summersolstice and autumnalequinox, then nega-tive up to wintersolstice and positiveagain to vernalequinox. Thesechanges are illus-trated by Fig. 22,which is analogousto Fig. 20. We see in this waythat one componentof the equation oftime…
Astronomy
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