Harris, John · Montreal, Lovell Printing and Publishing Co. · leaf 56
on of the sunsequator to the ecliptic is about 7° 15 (its nodes being as above stat-ed), and the period of rotation 25 days, 9 hours, 7 minutes ; the cor-responding synodic period 27 day?, 6 hours, 36 minutes.* The foregoing explanation is evidently based on anassumption that the centres of the… … pendicularto theechptic, asN.S. (fig. 7) this spot wouldbe at A., and would be seen projected on C, the centreof the sun. It is actually at Q., projected upon D., &c. * These periods are those of a spot in heliographic latitude 15°N. orS.of the suns equator. Owing to solar atmospheric drift,…
Astronomy
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