Quote:
Originally Posted by Robert Tulip
My last post confused this 65 million year cycle with the 26000 year cycle of precession. Is this 65 million year cycle the one which crossed the plane in 1998?
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No, the solstice points move along the ecliptic with the 25,800-year precession cycle.
The ~65-million-year oscillation is a movement of the sun north and south within the galactic disc. It can be modelled with reference to a notional "galactic plane", which aligns approximately with the galactic coordinate system. We passed through it from galactic south to north more than a million years ago.
Grant Hutchison