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[aprssig] [amsat-bb] Transit of Venus event 5/6 June

Greg Dolkas ko6th.greg at gmail.com
Tue Jun 5 15:20:05 UTC 2012


On Tue, Jun 5, 2012 at 2:11 AM, Bob Bruninga <bruninga at usna.edu> wrote:

> Re Transit of Venus:
>
> > Do I have my math right?  Your website says that
> > the transit starts around 05:13z, which is around
> > 10:13pm local time out here on the West Coast (UTC
> > -7).  How can that be, if according to the map, the
> > transit will still be in progress 5hrs later at
> > Sunset?
>
> I did a quick look at my site, and do not see the reference to 0513z.
>  Please let me know where the mistake is.
>
> I am in japan and cannot fix it anyway.  But I do know that it begins at
> about 6 PM EDT on the 5th of June on the east coast.
>
> GOod luck!
> Bob, WB4APR
>

It's at the end of the paragraph "Observing the Parallax" (colored emphasis
is mine), right below the picture of the Camera Obscura:

*Observing the Parallax:* The Transit of Venus is a fascinating event
historically as it gave early astronomers the first mechanism with which to
actually measure the distance from the Earth to the Sun and confirm their
underestanding of the size of Venus. During the 6 hour or so event, there
are 4 critical times as shown below. These instances will occur at slightly
different times for observers at different Earth locations because of
parallax. But generally begin at 0513z and end at 1126z.

Anyway, 5:13pm EDT (2:13pm PDT) works out a whole lot better.  Thanks!

Greg  KO6TH
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