6 Hours, 9 Minutes, 14 Seconds.
These mean Motions of the Luminaries are affected with various Inequalities: Of which,
- There are the Annual Equations of the aforesaid mean Motions of the Sun and Moon, and of the Apogee and Node of the Moon.
The Annual Equation of the mean Motion of the Sun, depends on the Eccentricity of the Earth's Orbit round the Sun, which is 1611⁄12 of such Parts, as that the Earth's mean Distance from the Sun shall be 1000: Whence 'tis call'd the Equation of the Centre; and is, when greatest, 1 degree, 56 minutes, 20 seconds.
The greatest Annual Equation of the Moon's mean Motion, is 11 degrees, 49 seconds; of her Apogee, 20 minutes, and of her Node, 9 minutes, 30 seconds.
And these four Annual Equations are always mutually proportional one to another: Wherefore when any of them is at the greatest, the other three will also be greatest; and when any one lessens, the other three will also be diminished