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At one date in the year, the Sun would be directly overhead at the North Pole, so its declination would be +90°. For the next few months, the subsolar point would move toward the South Pole at constant speed, crossing the circles of latitude at a constant rate, so that the solar declination would decrease linearly with time. Eventually, the ...
The equation above neglects the influence of atmospheric refraction (which lifts the solar disc — i.e. makes the solar disc appear higher in the sky — by approximately 0.6° when it is on the horizon) and the non-zero angle subtended by the solar disc — i.e. the apparent diameter of the sun — (about 0.5°). The times of the rising and ...
Solar longitude, commonly abbreviated as Ls, is the ecliptic longitude of the Sun, i.e. the position of the Sun on the celestial sphere along the ecliptic. It is also an effective measure of the position of the Earth (or any other Sun-orbiting body) in its orbit around the Sun, [ 1 ] usually taken as zero at the moment of the vernal equinox . [ 2 ]
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The Earth is tilted approximately 23.5 degrees on its axis, and each solstice is dictated by the amount of solar declination, or "the latitude of Earth where the sun is directly overhead at noon ...
Globes of the Earth often display an analemma as a two-dimensional figure of equation of time ("sun fast") vs. declination of the Sun. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation as it orbits around the Sun.
is the declination of the Sun in degrees, T G M T {\displaystyle T_{\mathrm {GMT} }} is the Greenwich Mean Time or UTC , in decimal hours since 00:00:00 UTC on the relevant date E m i n {\displaystyle E_{\mathrm {min} }} is the equation of time in minutes.
William Austin 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 ...
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