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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
Sunset and sunrise occur (approximately) when the zenith angle is 90°, where the hour angle h 0 satisfies [2] = . Precise times of sunset and sunrise occur when the upper limb of the Sun appears, as refracted by the atmosphere, to be on the horizon.
For a given latitude and a given date, calculate the declination of the Sun using longitude and solar noon time as inputs to the routine; Calculate the sunrise hour angle using the sunrise equation; Calculate the sunrise time, which is the solar noon time minus the sunrise hour angle in degree divided by 15;
On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant star are both overhead. At time 2, the planet has rotated 360° and the distant star is overhead again (1→2 = one sidereal day). But it is not until a little later, at time 3, that the Sun is overhead again (1→3 = one solar day). More simply, 1→2 is a complete ...
The current sunrise in Raleigh is around 7:35 a.m., and sunset is around 6:15 p.m., according to sunrise-sunset.org. Once daylight savings ends this weekend, here’s how the length of the day ...
The time change, which occurs on the second Sunday in March and ends the first Sunday in November, left many wondering what time sunrise and sunsets will occur now that we are no longer on ...
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 ...
These times are determined by location using zip code or current GPS location. It also provides moonrise and moonset, using the same manner and helping the hunter calculate lunar impact.