MG13 - Talk detail |
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Participant |
Sigismondi, Costantino | |||||||
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Institution |
ICRA - P.le Aldo Moro 5 - Rome - - Italy | |||||||
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Session |
SG1 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
Solar diameter, transit of Venus and General Relativity | |||||
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Abstract |
Preliminary data on the 2012 Venus transit's measurement of the solar diameter are presented from the Italian, French and Chinese collaboration. The seeing effects are reduced statistically to their minimal influence on the determination of the ingress/egress times. The photospheric and H-alpha diameters are proportional to the ratio between the observed total transit durations, and the duration calculated with the ephemerides for the standard solar photospheric radius of 959.63 arcsec, at the observing location. This method, by using alignments of planets, attains precision on the solar diameter measurement of space-based quality. A comparison with previous Mercury and Venus' transits is made, in view of a better comprehension of the Solar diameter's long term evolution. The measurement of solar oblateness is discussed with its relativistic implications. |
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Session |
HR1 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
Venus Transit: History and Opportunities for Gravitational Physics | |||||
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Abstract |
The transit of Venus has been exploited since 1639 to measure the distance Sun-Earth, fundamental unit for all astrophysics. An historical development of such measurement along the 7 transits of Venus observed up to now is presented, as well as other opportunities that this rare astronomical phenomenon gave to international science community. |
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