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2. Position of the Sun - Wikipedia

   en.wikipedia.org/wiki/Position_of_the_Sun

   A line graph of the Sun's declination during a year resembles a sine wave with an amplitude of 23.44°, but one lobe of the wave is several days longer than the other, among other differences. The following phenomena would occur if Earth were a perfect sphere , in a circular orbit around the Sun, and if its axis were tilted 90°, so that the ...

3. Sunrise equation - Wikipedia

   en.wikipedia.org/wiki/Sunrise_equation

   This plot was created using the simple sunrise equation, approximating the sun as a single point and does not take into account effects caused by the atmosphere or the diameter of the Sun. 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 ...

4. Burt's solar compass - Wikipedia

   en.wikipedia.org/wiki/Burt's_solar_compass

   Burt's solar compass or astronomical compass/sun compass is a surveying instrument that makes use of the Sun's direction instead of magnetism. William Austin Burt invented his solar compass in 1835. The solar compass works on the principle that the direction to the Sun at a specified time can be calculated if the position of the observer on the ...

5. Declination - Wikipedia

   en.wikipedia.org/wiki/Declination

   The root of the word declination (Latin, declinatio) means "a bending away" or "a bending down". It comes from the same root as the words incline ("bend forward") and recline ("bend backward"). [2] In some 18th and 19th century astronomical texts, declination is given as North Pole Distance (N.P.D.), which is equivalent to 90 – (declination ...

6. Sun path - Wikipedia

   en.wikipedia.org/wiki/Sun_path

   Sun path, sometimes also called day arc, refers to the daily (sunrise to sunset) and seasonal arc-like path that the Sun appears to follow across the sky as the Earth rotates and orbits the Sun. The Sun's path affects the length of daytime experienced and amount of daylight received along a certain latitude during a given season.

7. Analemma - Wikipedia

   en.wikipedia.org/wiki/Analemma

   An analemma can be traced by plotting the position of the Sun as viewed from a fixed position on Earth at the same clock time every day for an entire year, or by plotting a graph of the Sun's declination against the equation of time. The resulting curve resembles a long, slender figure-eight with one lobe much larger than the other.

8. Analemmatic sundial - Wikipedia

   en.wikipedia.org/wiki/Analemmatic_sundial

   The declination of the sun (determines the daily gnomon position). Analemmatic sundials are sometimes designed with a human as the gnomon. In this case the size of the hour marker ellipse is constrained by human height and the latitude of the sundial location, since the human gnomon shadow must fall on the hour marker ellipse to accurately ...

9. Solar azimuth angle - Wikipedia

   en.wikipedia.org/wiki/Solar_azimuth_angle

   The solar azimuth angle is the azimuth (horizontal angle with respect to north) of the Sun's position. [1] [2] [3] This horizontal coordinate defines the Sun's relative direction along the local horizon, whereas the solar zenith angle (or its complementary angle solar elevation) defines the Sun's apparent altitude.