תמונות בעמוד
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DECEMBER 1811.

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EXCEPTING the rotation of the Earth upon its axis, there is, as far as we know, no other body in nature, with which we are acquainted, whose motion is perfectly uniform and regular. The apparent motion of the Sun is very unequal, and therefore equal or true time, which flows on for ever in the same manner, cannot be truly measured by the Sun's apparent motion. Equal and true time is that which is shown by a well-regulated time-keeper, as a clock or watch; and in order that the apparent time, shewn by the sun-dial, may be made to agree with this, it must be corrected by proper equations, such as we have given in each of our astronomical portions, and an account of which we shall now endeavour to explain.

The difference between mean and apparent time depends chiefly on two causes, viz. 1. The obliquity of the ecliptic with respect to the equator; and, 2. The unequal motion of the Earth in its elliptical orbit.

Since the Earth's equator, any equal

axis is perpendicular to the plane of the
portions of the equator will, by means of the Earth's rota-
tion upon its axis, pass over the meridian in equal times;
and so, of course, would any equal portions of the ecliptic,
provided it were parallel to, or coincident with, the equator.
But as this is not the case, the daily motion of the Earth
upon its axis will carry unequal portions of the ecliptic over

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