A new treatise on astronomy, and the use of globes : in two parts ... (1866)
M'Intire, James, 1799-1879 · New York : Published by A.S. Barnes & Burr ... · leaf 88
on,is a great circle (6). It is evident that the plane of this circle■will be perpendicular to a line drawn from the centre of thesun to the centre of the earth, called the radius vector. When the earth is in Libra at A, the sun will appear in Aries,his polar distance being 90° (16), and the angle… … What does tliis change in the position of the poles with regard to thesua cause ? Draw the diagram, and fuUy illustrate the cause of thevariationa in the lengths of the day and night, and the diiferent seasonsof tlie year. 82 ASTRONOMY. of latitude (7, 14) ; and as all places on the surface of…
Astronomy
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