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Old March 30th 04, 05:40 PM
Pete Lawrence
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Default Old Moon in 30 somethings arms?

On Tue, 30 Mar 2004 16:02:53 GMT, "Francis Marion"
wrote:

It looks like a very over exposed image on the sunlit side, therefore the
"Earthlight" side has enough time to register an image on the unilluminated
part. It can't be easily seen with the naked eye, but a camera taking a
timed exposure should have no problems showing what your seeing.


Apart from the fact that I've never been able to personally image
Earthshine this late before (normally overloading the frame with the
lit part of the Moon), the previous older crescent Earthshine image I
took was visible with the naked eye. A bit of research shows that
there is a variation in the albedo of the Earth that peaks towards
spring in the Northern hemisphere (which I didn't know so that makes
it interesting to me at least).

http://science.nasa.gov/headlines/y2002/12apr_earthshine.htm

Nothing unusual about this really.


Actually there is something unusual here because I was under the
impression that Earthshine required a certain angular condition to
occur before it would appear. This angular constraint would mean that
the Moon would need to appear as a crescent for the appearance of
Earthshine.

A quick Google finds a backup link to this idea...
http://www.astro.umd.edu/education/astro/moon/earthshine.html

I've also not been able to locate any other images of Earthshine apart
from those that feature crescents (although I'm sure someone will be
able to rectify that .

So it *is* unusual enough to make me re-think my ideas about how it
occurs. Of course this is most likely personal indulgence and is
unlikely to be of interest to anyone else.

Nothing unusual about this really.

Blimey, when did we get to the point where we became so smart that we
could dismiss everything so easily?
--
Pete Lawrence
http://www.pbl33.co.uk
Astronomy & digital astroimaging