astronomical twilight


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Related to astronomical twilight: astronomical year

astronomical twilight

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So much so that the skies never get truly dark at this time of year and the sky remains in an astronomical twilight for what little of the night we have.
e) road lighting control is carried out by means of sensors and timers astronomical twilight
Astronomical twilight is from the end of nautical twilight until the Sun is 18[degrees] below the horizon.

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