Sunrise equation
Sunrise equation
Equation to derive time of sunset and sunrise.
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Readers' pathsAug 2026 – Oct 2026
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Declination
Astronomical coordinate analogous to latitude.
24%
Hour angle
Coordinates used in the equatorial coordinate system.
18%
Equation of time
Apparent solar time minus mean solar time.
17%
Position of the Sun
Calculating the Sun's location in the sky at a given time and place.
13%
Daytime
Period of a day in which a location experiences natural illumination.
8.2%
Horizontal coordinate system
Type of celestial coordinate system.
3.6%
Equatorial coordinate system
Celestial coordinate system used to specify the positions of celestial objects.
3.3%
Sidereal time
Timekeeping system on Earth relative to the celestial sphere.
2%
Right ascension
Astronomical equivalent of longitude.
1.8%
Solar time
Calculation of elapsed time by the apparent position of the sun.
1.5%
Readers come from
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Daytime
Period of a day in which a location experiences natural illumination.
25%
Hour angle
Coordinates used in the equatorial coordinate system.
21%
Sunrise
Time of day when the sun appears above the horizon.
21%
Sunset
Daily falling of the Sun below the horizon.
9.5%
Position of the Sun
Calculating the Sun's location in the sky at a given time and place.
3.4%