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Nick
Likewise with the English weather! Having lived in Cambridgeshire for a year I have nothing but admiration for the early astronomers and their perseverance to obtain enough results over time (through generations of observers) to be able to make inferences and predictions.
My interest is looking into some of the stone rings and their astronomical use for setting up a basic calendar as we went from being hunter gatherers to a more sedentary lifestyle with farming.
The Halley's comet aspect was an additional aside for another project. In September 1638 BCE, Voyager 4.5 showed a quite close return for Halley's comet before the autumnal equinox in late October that year. Its altitude was almost at the zenith at midnight on the 22nd.
Thanks once again for your help in pointing out that its orbit would experience perturbations.
Paul
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