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Equation of Time causes
The original attempt to explain the Equation of Time within
heliocentricity was made by Kepler who assigned a variable speed to axial rotation over the course of an annual orbit to account for the unequal length of a day.Of course axial rotation is constant. The next attempt was the 17th century analemmatists who attributed a variable axial tilt component to the astronomical correction but that mixes daylight/darkess asymmetry with the Equation of Time when the correction is based strictly on the total length of the natural day. The actual solution is at once more simple yet rapidly becomes complex. Apart from a tiny component,the Equation of Time reflects the rate of change of orbital orientation as axial rotation passes back to a line at 90 degrees to the Sun/Earth line. http://www.mhhe.com/physsci/astronom...ages/04f15.jpg The arrows represent the change in rate of orbital orientation in accordance with Keplerian geometry and orbital motion.The reason this change has not been noted up to now may be due to the fact that axial rotationtends to diminish the orbital effect as axial longitudes run almost paralell to orbital orientation and only hemispherical weather patterns and variations in daylight/darkness asymmetry indicate the changing relationship. The extreme local variation between axial longitudes and changing orbital orientation are best understood through the axial orientation of Uranus and the Earth's relationship is in accordance with this though far less pronounced - http://physics.uoregon.edu/~jimbrau/...13/FG13_06.jpg An accurate relationship between axial and orbital motions/orientations is crucial for recognising global climate norms which can be reduced further to hemispherical weather patterns (seasons) and from there to climate balances and imbalances. |
#2
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Equation of Time causes
I've always known that the Equation of Time was because the Earth isn't in a
circular orbit. -- Why do penguins walk so far to get to their nesting grounds? |
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