Transits of Venus. a Popular Account of Past and Coming Transits from the First Observed by Horrocks A.D. 1639 to the Transit of A.D. 2012

Transits of Venus. a Popular Account of Past and Coming Transits from the First Observed by Horrocks A.D. 1639 to the Transit of A.D. 2012

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 edition. Excerpt: ...time in 'which it comes up to the from the node), and the transit arc has a range of 3 32', there is a much greater chance of apair of transits when the conjunction-line is sweeping position V3 E3. We need not enter here into the calculations by which the exact time occupied in each part of the progression is determined. Let it suffice that the considerations just adduced serve to explain how it is that from June 1761 the epoch of the first transit of the last pair, to December 1874 the epoch of the first transit of this century's pair, is a period of only 113% years, whereas from December 1874 to June 2004 the epoch of the first transit ofjthe next pair, is a period of 129% years. The for'-rneriis the time occupied by the conjunction-line in nigving from the node V' to the position V3, when of course the other conjunction-lines have the position showngin fig. 19, and December transits occur; while the lattefiils the over the June transit-region, than when it is sweeping over the December trausitaegion. longer time occupied by the conjunction-line iV, ' E5 in moving up to V'E'. The sum of the two periods 113% and 129% is the period 243, just mentioned as that which separates two first transits either of a June pair or of a December pair. It is clear that if we start from the first-of a June pair, we have the following intervals between successive transits: 8 years, 105% years (8 from 113% years), 8 years, 121% years (8 from 129% years), and so on continually in the order 8, 105%, 8, 121%, so long as there is no break on account of a single transit occurring instead of a pair. This can manifestly happen, both at the December region and at the June region, though more readily at the former than at...show more

Product details

  • Paperback | 64 pages
  • 189 x 246 x 3mm | 132g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236867025
  • 9781236867025