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2004-2012: the transits of Venus
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Make a virtual observation of the transit of Venus
- observe a contact at the beginning or at the end of the transit
- if you wish to determine yourself the timing of the contact from images:
- look at the images of
the database and select two sites of observation well-situated on
Earth (educational sheet n°06, in french).
Attention, for the access to the database, you need a login which will be provided
to you by asking by e-mail at venus @ imcce.fr.
- interpolate the images to determine the timing of the contacts using the date in UTC
of each image.
- if you prefer to find directly the timings that you need:
- choose two contacts from two different sites in the database well-situated on
Earth (educational sheet n°06, in french)
- select the corresponding timings in
the database.
Attention, for the access to the database, you need a login which will be provided
to you by asking by e-mail at venus @ imcce.fr.
- calculate the Astronomical Unit
- use the formulae of the (educational sheet n°05b):
- using the Delisle's method needing only the observation of the same
contact from two different sites
- using the Halley's method needing the observation of two complete duration
of the transit from two different sites (the observation of two symetrical contact -beginning
and end- of the transit)
- observe Venus in front of the Sun during the transit
- choose an image in
the database (from any site).
Attention, for the access to the database, you need a login which will be provided
to you by asking by e-mail at venus @ imcce.fr.
- determine the distance beween the center of Venus and the center of the Sun
- calculate the Astronomical Unit
- iterate the operation with an image from the same site, and after from another site. Compare
the results and make averages to get the final value of the Astronomical Unit.
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