Anthony Ayiomamitis wrote:Thanks to you and Pete for a fascinating collaborative exercise!
> [concerning http://www.perseus.gr/Astro-Lunar-Parallax.htm]
> Thanks for the feedback Ernie.
I hope you'll forgive me now for blathering a bit, but it'll lead to a
We both got estimates of about 440,000 km, somewhat higher than the true
The situation looks something like this:
. * Selsey
The base we should be using,
. * Selsey ....... |
is the projection of the Selsey-Athens line onto the image plane. Its
I used geocentric equatorial coordinates. The r.a. and dec. of the Moon
Convert these to cartesian coordinates in the usual way:
x = cos( dec ) * cos( ra )
Subtract the Athens (x, y, z) from the Selsey (x, y, z) and normalize
When I did this, I got a length factor of 0.928. Multiplying this by the
> Anyway, a nice exercise. Just ask Oriel.Too bad Gerald's not equipped to appreciate it. It very much has the
flavor of the Ancient Greek efforts to measure the scale of the solar
- Ernie http://home.comcast.net/~erniew
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