Elements of Astronomy (Alfraganus)

I N D E X.

are named. 4
Meridian. 21
Miles on earth corresponding to a celestial degree. 30
Circular motion of the heavens. 7—10
Two principal motions in the heavens: common and proper. 15. Motion of longitude. 49 seqq. Motion of latitude. 67—73. True motion, mean motion. 46. 47. Proper motion of longitude of the fixed stars. 49. Of the Sun. 50. Of the Moon. 50—54. Of the five planets. 55—61. Apparent motion of the stars, slower, faster. 47. 61. 62
Node, ascending and descending. 48
Nycthemeron a day and a night (24-hour period), see Time.
Occultation of stars under the rays of the Sun, and its duration. 89—92 seqq.
Eight celestial orbs. 45, their order. 46
Eccentric orbs. 46, 54
Rising and setting of the stars, what it signifies in the Zodiac. 85—88
What parallax is. 99. 100. Above the Sun, and of the Sun itself, insensible; of the lower ones, sensible: how much for the Moon. 100. Parallax in longitude and latitude. 101. 102. In a Solar eclipse. 105. 106
Eccentrics and epicycles of the planets. 46—48. 64. Maximum latitude. 73. 74. Proper motions of four planets, composed of three motions, and of Mercury of four. 55—60. Retrogradation and station of the five planets. 61—63. Emergence from the rays of the Sun. 96—98.
Perigee, apogee. 46
Periodic revolutions of the stars in their orbs and through the Zodiac. 65. 66
Poles of the first motion, boreal, austral, 7. 15. Of the second motion. 16. 18
Regions and cities, which are encompassed by the seven climates. 35 seqq.

Retrogradation of the planets. 61—63
Celestial signs and their degrees. 16
Northern, southern. 17
Signs which rise slowly, quickly, equally. 94. 95
The Sun always illuminates half the orb of the Moon, and likewise of the earth. 102. 103
Proper motion of the Sun. 50. No latitude. 68. Insensible parallax. 100
Method of solar eclipse. 105. 107
Solstitial points. 17
Right sphere, oblique. 39
Star (especially the Sun and Moon). Why they appear larger at rising and setting. 10
Distance of the stars from the earth. 80—82. Dimension. 83—85. Transit through the meridian, rising, setting, what they signify in the Zodiac. 85—88. Occultation under the rays of the Sun and emergence. 89—92 seqq. See Fixed stars: Planets: Motion.
Quantity of nocturnal-diurnal time (nycthemeron) and its distinction into 24 hours. 42. 43
Earth, together with water, constitutes a globe. 11. 12. Placed in the middle of the celestial sphere. 13. With respect to the heavens, it is like a point. 13. 14
Habitable earth. 19. 20. Its general distinction. 21—24.
Special or proper, for different elevations of the pole. 24—29. Its area, longitude, latitude. 31. Seven climates. 32. 33.
Conical shadow of the earth, and how large. 103
Terrestrial globe analogous to the celestial. 19. Its dimension. 30. 31
Transit of stars through the meridian, what it signifies in the Zodiac. 85—88
Transpolar circle. 17
Shadow of the earth, and its quantity. 103
Zodiac. 16. 46