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Simultaneous transits of Venus and Mercury?
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Simultaneous transits of Venus and Mercury?
"Stuart Levy" writes:
I browsed a bit but couldn't find any on-line references suggesting specific values for rates of node advance for Mercury or Venus. From the 1992 edition of the Explanatory Supplement to the Astronomical Ephemeris, p. 316, we find for J2000 for mean equinox and ecliptic of that date: Mercury's node = 48.33° - 4.4630"/year Venus's node = 76.68° - 9.9689"/year However, the inclinations are not constant, so these are not representative of the long-term behavior. For a double transit, you would want to search for times when the inclination between the orbital planes of Venus and Earth was a minimum. Then Venus transits would be frequent enough that nodal alignments would be long-lasting, opening up many opportunities for double transits. Incidentally, I've added an appendix about transits seen from other solar system planets to my paper on the black drop effect at http://metaresearch.org/home/viewpoint/blackdrop.asp. -|Tom|- Tom Van Flandern - Washington, DC - see our web site on replacement astronomy research at http://metaresearch.org |
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Simultaneous transits of Venus and Mercury?
Hi,
"Stuart Levy" writes: I browsed a bit but couldn't find any on-line references suggesting The Journal of the British Astronomical Association has an article on this in its current issue (Vol 114 No. 3). It is not available online however http://www.britastro.com/jbaa/114-3.htm So summarise, they list three simeltaneous and near similtaneous transits, though none of us will be witnessing them!: 13,425 (the year) Sept 17th 0345 Venus Sept 17th 1927 Mercury 69,163 July 26th 1647 Venus July 26th 2031 Mercury 224,508 Mar 27th 2259 Venus Mar 28th 0339 Mercury specific values for rates of node advance for Mercury or Venus. From the 1992 edition of the Explanatory Supplement to the Astronomical Ephemeris, p. 316, we find for J2000 for mean equinox and ecliptic of that date: Mercury's node = 48.33° - 4.4630"/year Venus's node = 76.68° - 9.9689"/year However, the inclinations are not constant, so these are not representative of the long-term behavior. They mention this in their paper and state that to account for this they used formulae from Simon J L et. al, `Numerical expressions for precession formulae and mean elements for the Moon and the planets` Astron.Astrophysics 282, 663-683 (1984) [ http://adsabs.harvard.edu/cgi-bin/np...6A...282..663S ] I hope this is of help. Cheers, ~Al -- www.irishastronomy.org |
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