arati,
Hi,
I tend to agree. I doubt there is any reputable evidence to support orbit or spin reversal theories. However, it seems some evidence for magnetic reversals of the Poles has been accumulated from assaying the magnetic properties of rocks and sediments from land and sea beds. However, an actual reversal has never been 'measured', as far as I know, so all the evidence only allows one to interpret that and infer that reversals occurred and at what rate and how often. The time of a potential next reversal or temporary collapse of the magnetic poles has been extrapolated to between 3000-4000 AD.
