Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 117
aw irregularity. What i« the amount of the annual change in the position of the perihelion?In what direction doe* it move? Is this motion constant ? What is meant by the termanomalistic year ? What is its length ? How may this motion of the perihelion be con-ceived to take place ? In how long a… … ANOMALISTIC TEAR. instrument or mural circle,1 and the astronomical clock.8The daily apparent velocity of the sun at apogee, isnearly 57 12 (57 11,48,) and at perigee 1° Or, whichis the same as saying that the earths actual daily motionat her aphelion is 57/ 12, and at her perihelion 1° 01. 188.…
Astronomy
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