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. 2012Longmans, Green, 1878 - Počet stran: 236 |
Další vydání - Zobrazit všechny
Běžně se vyskytující výrazy a sousloví
accelerated ingress appear Astronomer Royal Campbell Island centre of Venus Chatham Island chord of transit circle v v conjunction conjunction-line corresponding Crozet Island darkened hemispheres Delisle's method Delislean poles difference duration earth expedition favourable Greenwich Greenwich Mean Halley Halley's method Halleyan pole Halleyan stations high at ingress illustrated internal contact Island Kerguelen Kerguelen Island latitude limb longitude Mauritius Mercury mid-transit miles minutes nearly node northern Halleyan observe the transit obtained occupied orbit parallel passage passed path of Venus photographic planet Plate XVI position Possession Island region retarded egress rotation seconds seen separate sunlit Sir G solar parallax southern station Stations for observing sun-views sun's centre sun's disc sun's distance sun's parallax sunlit and darkened supposed telescope tion Tobolsk TRANSIT BEGINS transit chord transit of 1761 transit of 1874 transit of Mercury transit of Venus Venus's centre whole transit
Oblíbené pasáže
Strana 18 - I then beheld a most agreeable spectacle—the object of my sanguine wishes; a spot of unusual magnitude and of a perfectly circular shape, which had already fully entered upon the Sun's disc on the left, so that the limbs of the Sun and Venus precisely coincided, forming an angle of contact. Not doubting that this was really the shadow of the planet, I immediately applied myself sedulously to observe it.
Strana 18 - About fifteen minutes past three in the afternoon, when I was again at liberty to continue my labours, the clouds, as if by divine interposition, were entirely dispersed, and I was once more invited to the grateful task of repeating my observations. I then beheld a most agreeable spectacle, the object of my sanguine wishes, a spot of unusual magnitude and of a perfectly circular shape, which had already fully entered upon the Sun's...
Strana 79 - Cloud was to be seen the whole day, and the Air was perfectly Clear, so that we had every advantage we could desire in observing the whole of the Passage of the planet Venus over the Sun's Disk. We very distinctly saw an Atmosphere or Dusky shade round the body of the planet, which very much disturbed the times of the Contact, particularly the two internal ones. Dr. Solander observed as well as Mr. Green and myself, and we differ'd from one another in Observing the times of the Contact much more...
Strana 3 - ... constructed. His observatory was situated in Paris, and its appliances were of the most primitive kind. By admitting the solar rays into a darkened room through a small round hole, an image of the Sun nine or ten inches in diameter was obtained upon a white screen. For the measurement of position angles a carefully divided circle was traced upon this screen, and the whole was so arranged that the circle could be made to coincide accurately with the image of the Sun. To determine the times of...
Strana 12 - ... These tables were so highly valued by their author that he had spoken of them as superior to all others — " quantum lenta solent inter viburna cupressi." But Horrox recognized many imperfections in them, and at length, as he says, " broke off the useless computation, resolved for the future -with my own eyes to observe the positions of the stars in the heavens ; but, lest so many hours should be entirely thrown away," he made use of his results to predict the positions of the planets.