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astrometry
astron.
astronaut
astronautics
astronavigation
astronomical
astronomical clock
astronomical telescope
astronomical twilight
astronomical unit
astronomical year
astronomy
astrophotography
astrophysics
AstroTurf
astute
astylar
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astronomical twilight
as·tro·nom·i·cal twi·light (plural as·tro·nom·i·cal twi·lights)


noun 
Definition:
 
period when Sun just below horizon: the period of time during which the Sun is at 18º below the horizon
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