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Time of year, location, and air quality all have an influence on the exact time of blue hour. [7] For instance in Egypt (every 21st of June), when sunset is at 7:59 PM: blue hour occurs from 7:59 PM to 9:35 PM. When sunrise is at 5:54 AM: blue hour occurs from 4:17 AM to 5:54 AM. Golden hour occurs from 5:54 AM to 6:28 AM and from 7:25 PM to 7: ...
Observers within 63°26' 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 of ...
Dawn is the time that marks the beginning of twilight before sunrise. It is recognized by the appearance of indirect sunlight being scattered in Earth's atmosphere , when the centre of the Sun 's disc has reached 18° below the observer's horizon . [ 1 ]
At nautical dusk, the Sun moves to 12° below the horizon in the evening. It marks the end of nautical twilight, which begins at civil dusk. At this time, objects are less distinguishable, and stars and planets appear to brighten. At astronomical dusk, the Sun's position is 18° below the horizon in the evening. It marks the end of astronomical ...
Time on a ship's clocks and in a ship's log had to be stated along with a "zone description", which was the number of hours to be added to zone time to obtain GMT, hence zero in the Greenwich time zone, with negative numbers from −1 to −12 for time zones to the east and positive numbers from +1 to +12 to the west (hours, minutes, and ...
A nautical almanac is a publication describing the positions of a selection of celestial bodies for the purpose of enabling navigators to use celestial navigation to determine the position of their ship while at sea.
Nautical polar twilight occurs at latitudes between about 72° 34' and 78° 34' North or South, which is exactly 6° to 12° inside the polar circles. There is then no civil twilight at the solar culmination, only nautical twilight. During nautical polar twilight, the human eye may distinguish general outlines of ground objects at midday but ...
The 59th parallel north is a circle of latitude that is 59 degrees north of the Earth's equatorial plane.It crosses Europe, Asia, the Pacific Ocean, North America, and the Atlantic Ocean.