a = THE EARTH appears to be immovable. b = THE STARS keep their relative places in the vault of the sky, and with the Sun and Moon, rise, move, and set. c = THE MOON'S bright part is of the shape of a ball enlightened by the Sun. d = THE MOON'S ECLIPSES occur when she is full. e = ECLIPSES OF THE SUN AND MOON often occur. f = THE MOON rises and sets at different times and places. Her course among the Stars varies. g = THE PLANETS are morning and evening Stars: are direct, stationary, and retrograde. h = THE SUN rises, culminates, and sets in different times and places at different seasons: different CONSTELLATIONS are visible at night. i = THE TIDES ebb and flow. j = Chald^ns. _The Sphere of the Heavens appears to make a Diurnal Revolution._ k = Greeks. The Moon receives her light _from the Sun_. l = Greeks. The Moon's Eclipses are caused by the _Earth's shadow._ m = Chald^ns. The Moon's Eclipses follow certain cycles. n = Greeks. The Moon appears to revolve monthly in an _oblique orbit_, which has _Nodes_ and an _Apogee_. o = Chaldeans. The Planets have proper motions and certain _Cycles_. p = Pythagoras. The Sun appears to move annually in an _Ecliptic_ oblique to the diurnal motion. q = The places of Stars are determined by their Longitude measured from the Equinox. r = The forms and dist^s of known parts of the earth are such as fit a convex surface. s = The visible Pole of the Heavens rises or drops as we travel N. or S. t = The boundary of the Earth's shadow is always circular. u = By observations of Eclipses, the Moon's Nodes and Apogee revolve, and her motion is unequal according to certain laws. v = By observations of the Planets, their progressions, stations, and retrogradations. w = By observations of the Sun, his motion is unequal according to certain laws. x = By observations, Longitudes of Stars increase. y = By observations, the Tides depend on the Moon and Sun. z = Aristotle? The Earth is a _Globe_, about which the Sphere of the Heavens performs a _Diurnal Revolution_. A = Hipparchus. The Moon appears to move in an _Epicycle_ carried by a Deferent: the _Velocity of Apogee_ and _Nodes_ determined. B = Eudoxus. The Planets appear to move in Epicycles carried by _Deferents_. C = Hipparchus. The Sun appears to move in an _Eccentric_, his _Apogee_ being fixed. D = Hippar. There is a _Precession of the Equinoxes_. E = By additional observations, the Moon's motion has another inequality. Evection. F = By additional observations, the Planets' motions in their Epicycles are unequal according to certain laws. G = By additional observations, the Sun's Apogee moves. Albategnius. H = Ptolemy. The Moon appears to move in an _Epicycle_ carried by an _Eccentric_. I = Ptolemy. The Planets appear to move in _Epicycles_ carried by _Eccentrics_. J = * _By the nature of motion_, the apparent motion is the same whether the Heavens or the Earth have a diurnal revolution: the latter is _simpler_.