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-   -   Day and Night (https://www.pprune.org/questions/135173-day-night.html)

jayteeto 24th Jun 2004 11:22

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???
:)

ETOPS 24th Jun 2004 11:40

Light & dark? :p

BigGreenPleasureMachine 24th Jun 2004 12:29

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:confused:

redsnail 24th Jun 2004 13:02

Where the boundary between dark and light is called the terminator.

Snigs 24th Jun 2004 13:10

And on the other side of the earth it's called the Terminator 2

Not stalking you reddo, honest! :)

jayteeto 24th Jun 2004 14:27

Thank you, that is what I am after....

panjandrum 25th Jun 2004 10:32

And the catch phrase for both dark and light is "I'lll be back":)

Pub User 26th Jun 2004 14:29

See this link

http://ston.jsc.nasa.gov/collections...-1995-3547.pdf

Old Smokey 27th Jun 2004 15:41

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.

jayteeto 27th Jun 2004 20:27

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.

eastern wiseguy 27th Jun 2004 21:57


Half dark and half light
isn't that a drink favoured by old blokes with whippets?


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