Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 107
uatoiis the straight line that passes through its centre perpendicular to itsplane. What is the annual motion of this point in longitude 1 In how many years would itmake the circuit of the ecliptic t In what way can we form an idea of this motion of th»•nuinoctuJ points 1 Explain from figure. THE… … PRECESSION EXPLAINED. P1 is always at the same distance from P revolving as itdoes in a circle about P. 148. The following illustration may tend still further FIG. 32
Astronomy
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