From: kutchScience
Dear Science and Astronomy friends,

Sub: Changing Arc size of transit planets (Venus Marcury)

As per I know, Though we consider Venus orbit bit more circular in comparison of
Earth's orbit, Earth Aphelion (Near July planetary transits) gives smaller arc
size of planets Venus and Mercury. And if associated perihelion of Venus and
Mercury gives the smallest arc size of those transit planets.

Visa versa Earth perihelion (Near January planetary transits) gives bigger arc
size of planets Venus and Mercury. And if associated aphelion of Venus and
Mercury gives the biggest arc size of those transit planets.

Dr.BHUDIA-Science Group Of INDIA.
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--- In VenusTransit@yahoogroups.com, Rathnasree Nandivada <rathnasree63@y...>
wrote:
> Prof. Srivastava,
>
> The 2004 and 2012 transits are during the June node -
> the pairs on either side of that - the 1874 and 1882
> ones as well as the 22nd century ones - occur at the
> December nodes - and so on.
>
> For Mercury transits - the frequencies for the two
> nodes are different - depending on Mercury being
> closer to perihelion at one of the transits -
>
>
> I am adding something here from older discussions -
>
> About the November and May Mercury Transits and the
> higher frequency
> of the November ones - this is what Fred Espenak says
> in the NASA
> GSFC site devoted to transits -
>
> ---During November transits, Mercury is near
> perihelion and exhibits
> a disk only 10 arc-seconds in diameter. By comparison,
> the planet is
> near aphelion during May transits and appears 12
> arc-seconds across.
> However, the probability of a May transit is smaller
> by a factor of
> almost two. Mercury's slower orbital motion at
> aphelion makes it less
> likely to cross the node during the critical
> period.---
>
> I am not fully comfortable with this logic yet, as it
> seems a little
> contrary to the usual Astrophysical argument that if
> some phase space
> is covered faster by a body - the frequency of
> occurence in that
> phase space would be smaller - but, I am sure, I am
> missing
> something, in my argument.
>
> the above was the discussion a few months ago - I have
> not tried to understnd this better since then, though,
> what with exploring so many other aspects :-(
>
> I suppose the more cirular orbit of Venus encures
> roughly equal frequency of occurence for transits at
> both nodes.
>
> Rathna







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