begin morning civil twilight — The period of time at which the sun is halfway between beginning morning and nautical twilight and sunrise, when there is enough light to see objects clearly with the unaided eye. At this time, light intensification devices are no longer… … Military dictionary
civil twilight — noun : the period after sunset or before sunrise ending or beginning when the sun is about 6 degrees below the horizon and during which on clear days there is enough light for ordinary outdoor occupations * * * civil twilight noun (astronomy) The … Useful english dictionary
end evening civil twilight — The time period when the sun has dropped 6 degrees beneath the western horizon; it is the instant at which there is no longer sufficient light to see objects with the unaided eye. Light intensification devices are recommended from this time until … Military dictionary
civil twilight — noun The period in which the sun is less than 6° below the horizon in the morning and evening … Wiktionary
Twilight — For other uses, see Twilight (disambiguation). Twilight at Riga Bridge … Wikipedia
twilight — The period of incomplete darkness following sunset and preceding sunrise. Twilight is designated as civil, nautical, or astronomical, as the darker limit occurs when the center of the sun is 6°, 12°, and 18°, respectively, below the celestial… … Aviation dictionary
Twilight Zone: The Movie — Original 1983 theatrical poster Directed by John Landis (prologue and segment 1) Steven Spielberg (segment 2) … Wikipedia
The Twilight Samurai — is a 2002 Japanese film directed by Yoji Yamada. Set in mid 19th century Japan, a few years before the Meiji Restoration, it follows the life of Seibei Iguchi, a low ranking samurai employed as a bureaucrat. Poor, but not destitute, he still… … Wikipedia
Night Aviation Regulations in the USA — Night Aviation Regulations There are at least three definitions of night time as it pertains to the Federal Aviation Regulations in the United States. 1) The standard definition of night is the period between evening civil twilight and morning… … Wikipedia
daylight — The period of time during any day that begins with the morning civil twilight and ends with the evening civil twilight. Civil twilight is the period before sunrise and after sunset when the sun’s center is between 0° and 6° below the horizon … Aviation dictionary
BMCT — Begin Morning Civil Twilight ( BMCT ) is a military term defined by the Department of Defense (DoD) of USA. It is defined as the period of time at which the sun is halfway between beginning morning and nautical twilight and sunrise, when there is … Wikipedia