As for the Little Dipper, it is circumpolar â always above the horizon â as far south as the tropic of Cancer (23.5 degrees north latitude). Stars in the Big Dipper via EarthSky Facebook friend Ken Christison. He captured this photo on September 9, 2013.
dwell time (usually uncountable, plural dwell times) (chiefly engineering) The period of time that a system or element of a system remains in a given state. The drone has a dwell time of about six hours when operating from an in-theater airfield. The part needs a total dwell time in the autoclave of 95 minutes. (military) The duty time soldiers have at their domestic home base between foreign deployments.
Night or nighttime (sp. night-time or night time) is the period of time between the sunset and the sunrise when the Sun is below the horizon. Complete darkness or astronomical night is the period of time between astronomical dusk and astronomical dawn when the sun is between 18 and 90 degrees below the horizon and the sky is totally dark.