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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 ...
J transit is the Julian date for the local true solar transit (or solar noon). 2451545.0 is noon of the equivalent Julian year reference. 0.0053 sin M − 0.0069 sin ( 2 λ ) {\displaystyle 0.0053\sin M-0.0069\sin \left(2\lambda \right)} is a simplified version of the equation of time .
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 ...
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 ...
solar declination tables, on use of quadrant and astrolabe to determine latitude with reference to both North Star and sun 9v 25r – Geography Old World – Europe 25v 42r – Geography Old World – Asia 42r 52r – Geography Old World – Africa 52r 63v – Geography New World – Portuguese discoveries south of the equator ie Brazil: 63v ...
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