Day and Night
Thread Starter
Join Date: Aug 2000
Location: Liverpool based Geordie, so calm down, calm down kidda!!
Age: 60
Posts: 2,051
Likes: 0
Received 17 Likes
on
6 Posts
Day and Night
There is a technical term for the part of the earth that is in light and the part in shadow. Other than the obvious Day/Night/Light/Dark, has anyone any ideas???
Last edited by jayteeto; 24th Jun 2004 at 11:50.
Join Date: Jul 2000
Location: 1060 West Addison
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Well, when in an eclipse, the really dark bit is the umbra, and the not so dark bit is the penumbra. Not sure if this applies if the shadow is being cast by one's own planet
PPRuNe Handmaiden
Where the boundary between dark and light is called the terminator.
Join Date: Nov 2000
Location: Grobelling through the murk to the sunshine above.
Age: 60
Posts: 562
Likes: 0
Received 0 Likes
on
0 Posts
Join Date: Jun 2004
Location: Australia
Posts: 1,843
Likes: 0
Received 0 Likes
on
0 Posts
Are you referring to Morning Civil Twilight and Evening Civil Twilight?
These are the times of day between when the upper limb of the sun is 6 degrees below the horizon and the upper limb of the sun appears upon the horizon.
These are the times of day between when the upper limb of the sun is 6 degrees below the horizon and the upper limb of the sun appears upon the horizon.
Thread Starter
Join Date: Aug 2000
Location: Liverpool based Geordie, so calm down, calm down kidda!!
Age: 60
Posts: 2,051
Likes: 0
Received 17 Likes
on
6 Posts
Not MCT or ECT, but thanks anyway. I mean the two bits that you would see if you were viewing from outer space. Half dark and half light. They have a proper reference name.