[5]. When he is between the Earth and the Sun in the nearer part of his Orbit.
[6]. The time between the Sun’s rising and setting.
[7]. One entire revolution, or 24 hours.
[8]. These are lesser circles parallel to the Equator, and as many degrees from it, towards the Poles, as the Axis of the Planet is inclined to the Axis of it’s Orbit. When the Sun is advanced so far north or south of the Equator as to be directly over either Tropic, he goes no farther; but returns towards the other.
[9]. These are lesser circles round the Poles, and as far from them as the Tropics are from the Equator. The Poles are the very north and south points of the Planet.
[10]. A Degree is a 360th part of any Circle. See § [21].
[11]. The Limit of any inhabitant’s view, where the Sky seems to touch the Planet all round him.
[12]. This is not strictly true, as will appear when we come to treat of the Recession of the Equinoctial Points in the Heavens § [246]; which recession is equal to the deviation of the Earth’s Axis from it’s parallelism: but this is rather too small to be sensible in an age, except to those who make very nice observations.
[13]. Memoirs d’Acad. ann. 1720.
[14]. The Moon’s Orbit crosses the Ecliptic in two opposite points called the Moon’s Nodes; so that one half of her Orbit is above the Ecliptic, and the other half below it. The Angle of it’s Obliquity is 51⁄3 degrees.