Cool!  I'm familiar with libration, but I did not know that you could
exploit to create a stereo picture of the moon.  I'll have to try that
sometime.

-Mario

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of J FLETCHER
Sent: Tuesday, November 27, 2007 4:57 PM
To: Microcontroller discussion list - Public.
Subject: Re: [OT]: Which way is up? (Was:Total Lunar Eclipse)


Hi Mario,
   
  I know the moon keeps the same face towards us, more or less. 
  I meant that the "disc" of the moon appears to rotate clockwise, like
a 
  disc on a record deck. 
   
  A process called libration allows us to see sometimes a little more of
the 
  western limb of the moon, sometimes more of the eastern limb. I used
to
  photograph every full moon I could, then compare the photographs. When

  viewed as a stereo pair it was possible to see the curvature of the
moon's 
  globe, with carefully chosen prints.
   
  John

piclist@mmendes.com wrote:
  If you were to fly around the earth in order to always keep the moon 
above your
head, you'd see it slowly go though it's phases (over the period of a
month, a
full phase), but you'd always see the same face of the moon, because
it's
rotation rate is the same as its orbit rate around the earth.

-Mario


Quoting J FLETCHER :

> I think the moon looks different from different longitudes, too. As 
> it moves across
> the sky (east to west) the disc appears to rotate clockwise.


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist



-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist