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The Equinox
The Earth's terminator rewpressnts a fixed reference to the Sun and
can be demarcated by the direction of the arrows over the course of an annual orbit - http://www.honeysucklecreek.net/imag...6689creth1.jpg http://www.mhhe.com/physsci/astronom...ages/04f15.jpg The global unequal lengths of the natural noon cycles,supposing axial rotation is constant or near enough constant, represent a longitudinal change in the motion of the Earth,this can be observationally confirmed using the sequence of images from Uranus - http://astro.berkeley.edu/~imke/Infr..._2001_2005.jpg With axial rotational orientation at almost 90 degrees to the change in orbital orientation,it is fairly easy to isolate the orbital component in Uranus however as axial orientation and rotation runs almost parallel to the orbital change on Earth it is very difficult to discern save the unequal lengths of the natural noon cycles. In the representation demonstrating Keplerian orbital geometry,it is possible to gauge the longitudinal orbital orientational change against the fixed orientation of the Earth's terminator at the Equator. There is no advantage in maintaining 'axial tilt' as a pseudo- dynamic,the fact that local rotations and orientations can blot out larger motions is probably the main reason why the false perception still remains - http://www.astronomy.org/programs/se...ns-general.gif |
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