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A solar noon is defined when the Sun is directly above.because the Earth revolves round the Sun, the point that is above would always have changed because earth is in a different position
from the previous noon.
the earth's orbit is not a circle but an eclipe it travels in a high speed when in contact to the sun and more slow when far from
the sun. The duration from solar noon to solar noon is a sidereal
day,in addition,the time it takes to compensate
for how long it has traveled in its orbit
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