The planetarium, and astronomical calculator .. (1833)
Ostrander, Tobias · New York, M'Elrath, Bangs & Herbert · leaf 201
re atm in the 47£ minutes after 10, with the other foot de-scribe the circle T Y for the Moons disk, as seen fromLondon at the time when the eclipse is at the greatest,and the portion of the Suns disk, which is hidden or cutoff by the disk of the Moon, will show the quantity ofthe eclipse at that… … SEC. XVI.] DELINEATION OF SOLAR ECLIPSES. 191 Lastly, take the semidiameter of the penumbra, 31minutes and 3 seconds, from the scale A C, in your com-passes, and setting one foot in the line of the penum-bras path, on the left hand, from the axis of the ecliptic,direct the other foot towards the…
Astronomy
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