The sunrise equation as follows can be used to derive the time of sunrise and sunset for any solar declination and latitude in terms of local solar time when sunrise and sunset actually occur:
:\cos \omega_o = -\operatorname{tan}(\phi) \times \operatorname{tan}( \delta)
where:
:\,\!\omega_o is the hour angle in degrees at either sunrise (when negative value is taken) or sunset (when positive value is taken);
:\,\!\phi is the latitude of the observer on the Earth;
:\,\!\delta is the sun declination.
Theory of the Equation
The Earth rotates at the angular speed of 15°/hour and, therefor...
Mar 22 at 4:26, by drachenstern
The sunrise equation as follows can be used to derive the time of sunrise and sunset for any solar declination and latitude in terms of local solar time when sunrise and sunset actually occur:
:\cos \omega_o = -\operatorname{tan}(\phi) \times \operatorname{tan}( \delta)
where:
:\,\!\omega_o is the hour angle in degrees at either sunrise (when negative value is taken) or sunset (when positive value is taken);
:\,\!\phi is the latitude of the observer on the Earth;
:\,\!\delta is the sun declination.
Theory of the Equation
The Earth rotates at the angular speed of 15°/hour and, therefor...
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