In astronomy, a moving line that divides the daylit side and the dark night side of a planetary body is called...

an isocline
a terminator
an isohelia
a circle of latitude
A terminator or twilight zone is a moving line that divides the daylit side and the dark night side of a planetary body. A terminator is defined as the locus of points on a planet or moon where the line through its parent star is tangent. An observer on the terminator of such an orbiting body with an atmosphere would experience twilight due to light scattering by particles in the gaseous layer.
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an isocline
a terminator
an isohelia
a circle of latitude
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