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Time zones of South Asia (numbers are hours ahead of UTC) The time in Afghanistan follows a single standard time offset of UTC+04:30 (four and a half hours ahead of Coordinated Universal Time), [1] even though the country spans almost two geographical time zones. The official national standard time is called Afghanistan Time (AFT) internationally.
The sunrise equation or sunset equation can be used to derive the time of sunrise or sunset for any solar declination and latitude in terms of local solar time when sunrise and sunset actually occur. Formulation
Calculate the sunset time, which is the solar noon time plus the sunset hour angle in degree divided by 15; Use the sunset time as input to the solar geometry routine to get the solar azimuth angle at sunset. An interesting feature in the figure on the right is apparent hemispheric symmetry in regions where daily sunrise and sunset actually occur.
An Excel workbook with VBA functions for twilight (dawn and dusk), sunrise, solar noon, sunset, and solar position (azimuth and elevation) by Greg Pelletier, translated from NOAA's online calculator for sunrise/sunset; Time and Date to find the current state of the sun in a specified place. "Twilight" . Encyclopædia Britannica. Vol. 27 (11th ...
Time of sunrise in 2008 for Libreville, Gabon. Near the equator, the variation of the time of sunrise is mainly governed by the variation of the equation of time. See here for the sunrise chart of a different location. The timing of sunrise varies throughout the year and is also affected by the viewer's latitude and longitude, altitude, and ...
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The times of sunset and sunrise vary with the observer's location (longitude and latitude), so the dates when day and night are equal also depend upon the observer's location. A third correction for the visual observation of a sunrise (or sunset) is the angle between the apparent horizon as seen by an observer and the geometric (or sensible ...
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