First opening or expansion; first appearance; beginning; rise.
Same as Civil Dawn; the time of morning at which the sun is 6 degrees below the horizon. At this time, there is enough light for objects to be distiguishable and that outdoor activities can commence.
The first appearance of light in the eastern sky before sunrise; or the time of that appearance. The glow is produced by the scattering of light reaching the upper atmosphere prior to the sun’s rise to the observer’s horizon.
(adj.) the time each morning at which day light first appears
The time of day immediately preceding sunrise.
the first light of day; "we got up before dawn"; "they talked until morning"
the earliest period; "the dawn of civilization"; "the morning of the world"
appear or develop; "The age of computers had dawned"
become light; "It started to dawn, and we had to get up"
(as used by sunPATH) The time each morning at which daylight first begins, the period of increasing light between dark and Sunrise. sunPATH calculates the approximate point in time when there should be enough light from the sky for an exposure at T1.3, 500ASA, 24fps (1/48sec). This is considered by some as “Magic Hour.” Terrain features and weather conditions can limit the available skylight. (This is not astronomical, civil or nautical twilight.)
The first light visible in the solar sky before sunrise or the time of that appearance. Dawn is synonymous with "daybreak" and the beginning of morning twilight. Twilight is not an antonym of "dawn," although dusk is used this way in nontechnical language.
The first appearance of light in the eastern sky before sunrise. It marks the beginning of morning twilight. The visual display is created by the scattering of light reaching the upper atmosphere prior to the sun's rise to the observer's horizon.
Dawn is the period of time immediately preceding sunrise. It is recognized by the presence of weak sunlight, despite the fact that the sun itself is still below the horizon.