... 12c. Venus transit (1) . ... Predictions for the transit give four "contact" times, at which the dark Venus disk touches the edge of the Sun's disk (marked by numbers on Figure 3 )" . First contact - Venus disk touches the Sun from the outside , on entry . Second contact - Venus disk touches the Sun from the inside , on entry . Third contact - Venus disk touches the Sun from the inside , on exit . Fourth contact - Venus disk touches the Sun from the outside , on exit . ... sin? sin? ...

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... ARTICLE: The Adventurous Search For The Astronomical Unit . ... Kepler himself had suggested to use the rare occasions of Venus transiting (crossing) the solar disk to measure our distance to the planet. ... Due to the orbital inclination of Venus against the ecliptic of 3.5°, a Venus transit is so rare that it happens only at intervals of 121.5 years, 8 years, 105.5 years, 8 years and so on. ... Crabtree witnessing the transit of Venus 1639 . ... Transits of Venus - The Quest for the Solar Parallax...

Next: Observatory Contacts Up: Submitting a Telescope Proposal Previous: Proposal Deadlines and Procedures . ... The recommendations of the referees serve to guide the Arecibo Scheduling Advisory Committee (ASAC) in respect of the time allocation and relative ranking of all proposals. ... The proposal will be scheduled only if time is available. If not scheduled within the next two 4-month scheduling periods (beginning 4 months after the proposal deadline), the proposers will need to resubmit. ...

... during the 6th June 2012 transit of Venus. ... Nowadays, astronomers use accurate observations of the same phenomenon, that is the transit of an extra solar planet (exoplanet) in front of a distant star, to infer the size and distance of such planets orbiting other stars. ... Armagh Observatory is presently running a Transit of Venus Exhibition, from 10am 11am and 3pm 4pm during week-days, until Tuesday 12th June where some images of the June 2012 transit are on show. ... Last Revised: 2012 June 8th...

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... General information . ... Staff . Research staff . ... Information . ... Historical highlights . Historical research . ... This process is thought to occur in circumstellar disks of gas and dust around young stars on rather short timescales : infrared surveys show that the number of low mass stars with disks drops dramatically for stars older than 10 Myr, suggesting that in order to form large solids before the disk disperses, the growth process has to take place within a few million years. ...

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