A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 60
at circle, which divides the celestial sphere into equal parts,passing through the centre of the earth, and situated at a distance fromthe plane of the sensible horizon equal to the semi-diameter of the earth,or nearly 4,000 miles. 75. The great circle of the celestial sphere which is paral-lel to… … SENSIBLE AND RATIONAL HOKIZON. 56 THE HORIZON. It divides the earth and the celestial sphere into upper andlower hemispheres. The terms upper and lower, above and below, and the like, are onlyapplicable to the horizon. The rational horizon is the real horizon ;it is the standard circle for…
Astronomy
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