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Precept 6. Latitude of a Star, or Planet, is an Arc of a great Circle, interſecting the Ecliptic at right angles, and paſſing through the Poles thereof; that on the North ſide of the Ecliptic is called North Latitude, and the other ſide South.
Precept 7. Azimuths are Vertical Circles, paſſing through the Zenith and Nadir, interſecting the Horizon at right Angles, and counted from the South, and North, towards the Eaſt and Weſt, or it is an Arc of the Horizon, intercepted between the North, or South Points, and the place where any celestial body riſes or ſets.
Precept 8. Amplitude of the Sun, or a Star, is an Arc of the Horizon, intercepted between the East or West Points, and that Point where the object riſes or ſets; and note! you will find the degrees of the Azimuths, and Amplitudes on the Horizon of the Index to the Planisphere; the degree of Amplitude at riſing, is called Amplitude Ortive, and Occaſive at ſetting, which muſt be denominated, whether it be North, or South.
Precept 9. Cosmical Rising, or Setting, is when a Star or Planet riſes or ſets when the Sun doth.
Precept 10. Achronical Rising, and Setting, is when a Star, or other object riſes, when the Sun ſets, or ſets when the Sun riſes.
Precept 11. Circles of perpetual Apparition,
