Harris, John · Montreal, Lovell Printing and Publishing Co. · leaf 48
hese positionslet P Q represent the axis of the earth, about which its diurnal rota-tion is performed without interfering with its annual motion in itsorbit. Then, since the sun can only enlighten one half of the surfaceat once, viz., that turned towards it, the shaded portions of the globein its… … iCt the equinoctial F E, and the ecliptic R G. It is, therefore, in thevernal equinox, and in this position the poles P Q, both fall on theextreme confines of the enlightened side. In this position, therefore,it is day over half the northern and half the southern hemisphere atonce; and as the earth…
Astronomy
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