The Observatory Volume N . 30

The Observatory Volume N . 30

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ... 453 of the Hijra, or A.d. 1061. As El Hakim was murdered in 411 or A.d. 1020, Ali must have been born at the latest in 989, so that he could very well say that he was a youth when he saw the comet of 1006. The mistake of referring this comet to the year 1200 was made by Riccioli, whom Hevelius, Lubienitzky, and Struyck have followed; it must have been caused by an error of translation in the Latin edition of 'Ali ben Ridwan's commentary to the ' Quadripartitum ' of Ptolemy. According to Ali this comet appeared in the middle of the sign of Scorpio (15th degree); the head was three times as large as Venus and it gave as much light as a fourth part of the Moon. It moved from east to west as far as the 15th degree of Virgo. It must have appeared about the 30th April, which is the date calculated by Pingre from the places of the planets given by Ali, probably from calculation. It is very remarkable that a star as bright as Venus is stated by several chronicles to have appeared at that time. The Annals of St. Gall say that it was seen for three months "in iiitimis finibus austri ultra omnia signa quae videntur in coelo." The Syrian Chronicle of Abu'l Faraj places it in the zodiacal constellation of 'akraba or Scorpio; its rays were "moved," it shone like the Moon and disappeared after lasting four months. According to the Arabian Chronicle of Ibn al Athir a great star like Venus appeared on the 3rd May, 1006, to the left of the direction of Mecca from Babylonia; it shed its rays on the Earth like the rays of the Moon and lasted till the 13th August. See Schonfeld's paper ou this star, Astr. Nachr. 3034. It is a pity that Abu'l Faraj does not mention this star in his excellent work on Ptolemaic astronomy, but after all we could...
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Product details

  • Paperback | 194 pages
  • 189 x 246 x 10mm | 354g
  • United States
  • English
  • black & white illustrations
  • 1236510380
  • 9781236510389