[Magdalen] Good grief! talk about a rare event! Wonderful photo.

[Roger Stokes]

On 13/10/2015 21:11, James Oppenheimer-Crawford wrote:
> I did not know this, but apparently we have a satellite waaay out there
> watching the earth. As it happens, the moon came between the satellite and
> the earth, and it also just happened that this happened when the sun was
> behind the "photographer," so we get a full sphere (well, virtually full) of both the earth and the moon.

This satellite is always between the sun and the earth at a point where 
the gravitational pull of the two of them balances out so it's falling 
towards neither of them, orbiting the Sun in synchronicity with the Earth..

> This link points to the NASA web site's animation of a series of photos.
> This is a real jaw dropper. Both the Earth and the moon are in focus at the
> same time, which initially made me think this had to be a hoax. From that distance, however, I guess focal length isn't a big factor....

Quite, set it to infinity.

Roger