Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 42
ses until the distance of the pencil point from the steel point isequal to the measured distance — making use for this purpose ofthe scale of degrees in the margin, and then with the steel point THE MOON S PATH AMONG THE STARS 29 carefully centered on the comparison star, strike a short arc withthe… … Pig.28 be assumed to give results nearer the truth. Pig. 28 shows thepositions of the moon January 6 to January 9 as plotted from theabove measures. Length of the Month. — If it happens that one of the positions ob-served in the second month falls between the places obtained on twosuccessive days…
Astronomy
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