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When does civil twilight start and end?
When does twilight start & end?
What is “civil twilight”?
What is twilight phase?
During civil twilight, the geometric center of the Sun's disk is at most 6 degrees below the horizon. In the morning, this twilight phase ends at sunrise; in the evening it begins at sunset. Sunrise and sunset are the moments when the Sun's upper edge touches the horizon.
Oct 28, 2023 · According to the Navy's site, today at Rocky Mountain Metro Airport (KBJC) civil twilight ends at 6:31 PM, and begins again tomorrow morning at 6:58 AM. So if you're flying at KBJC, you can begin logging night flight time any time between 6:31 PM tonight, and 6:58 AM tomorrow morning.
According to the AIM and Pilot/Controller Glossary, “civil twilight” is defined as follows: “Civil twilight ends in the evening when the center of the sun’s disk is 6 degrees below the horizon and begins in the morning when the center of the sun’s disk is 6 degrees below the horizon.”
This data service provides rise, set, and transit times for the Sun and Moon, civil twilight beginning and end times , and lunar phase information for any year between 1700 and 2100. First,...
Mar 1, 2022 · Stages of twilight are based on solar angle, and civil twilight “is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 6 degrees below the horizon. This is the limit at which twilight illumination is sufficient, under good weather conditions, for terrestrial objects to be clearly distinguished.”
Observers within 63°47'50" of the Equator can view twilight twice each day on every date between the month of the autumnal equinox and the month of vernal equinox between astronomical dawn, nautical dawn, or civil dawn, and sunrise as well as between sunset and civil dusk, nautical dusk, or astronomical dusk, i.e., from September 1 to March 31 ...
