Elements of Astronomy (Alfraganus)

of Matters contained in the Astronomical Elements of Alfraganus.

A large decorative drop cap 'A' is enclosed within a square frame decorated with foliage and scrolls. It serves as the initial for the index entries starting with the letter A.

Highest and lowest absis apsis. pag.
Equator of the day. 16
Equinoctial points. 17.
Era of the Arabs, Persians, Romans, Syrians, Egyptians, etc. 6
Quantity of the year according to the Arabs. 2
Apogaeum apogee, perigaeum perigee. 46
Diurnal and nocturnal arc. 43
What are ascensions. 40. Right, oblique. 39. 42. Double variation of oblique ascensions, simple of right. 43.
Head and tail of the Dragon referring to the lunar nodes. 48. Their motion. 51. 53
Celestial circles: Equator of the day, Zodiac, with the Ecliptic. 16. Transpolar or Colure. 17. Horizon, Meridian. 21
Eccentric circles, and epicycles of the planets. 46—48
Seven habitable climates of the earth, through which places they pass, by reason of the longest day, and the altitude of the pole, and their intervals. 32. 33. Which places they encompass by name. 35 seqq.
Roundness of the heavens and circular motion demonstrated. 7—10
Eight celestial orbs. 45
Colure of the solstices. 17
Seven days of the Arabs. 2
Beginning of the day according to the Arabs. 2. According to the Romans. 3
Beginning of the Astronomical day. 43
Variation of days and nights. 22. 24 seqq.
Dimension of the terrestrial globe. 30. 31. Of the stars. 83—85.
Distances of the stars from the earth. 80—82
Eccentrics and epicycles of the planets.

46—48. Their mutual relationship. 64
Lunar eclipse. 102—104. Solar. 105—107.
Intervals of succeeding eclipses. 108. 109.
Ecliptic. 16. Its declination. 17. 18
Diverse epochs. 6
Fixed stars, why so called. 50. Their proper motion. 49. They maintain the same latitude. 68
Six classes of the fixed stars according to magnitude. 74. Number of each class. 75. Names and places of the fixed stars of the first magnitude. 75. 76. Names and places of the fixed stars which they call mansions of the Moon. 77—79
Miles on earth corresponding to a celestial degree. 30
Equal and unequal hours; and their times. 44
Horizon. 20
Latitude of a place. 35
Motion of the latitude of the stars. 67 seqq. Maximum latitude of the planets. 73. Latitude of the fixed stars is fixed. 68. None for the Sun. 68
Longitude of a place. 35
Motion of longitude. 49 seqq.
Five proper motions of the Moon. 50—54. Maximum latitude. 73. Twenty-eight mansions. 77 seqq.
How much the parallax of the Moon is. 100
Rising of the new Moon. 93. 96
Method of lunar eclipse. 102—104
Magnitudes of the stars. 74 seqq. 83—85.
Months of the Arabs, and their distinct quantity. 1
Months of the Syrians; Romans; Persians; Egyptians. 4. 5
Double beginning of the month. 2
How the days of the months are named by the Persians. 4