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tiompan wrote:
bawn79 wrote:
This just makes me wonder even more about how people over 5000 years ago did this.
Fecking hell!
They were bright feckers . excuse pun
No doubt about it! Forward-thinking mofos, as Mr Cope put it.

Yes, and the only way to be sure is by trial and error. As the day doesn't have to be bright and clear, this can take two or three years. It's easier at the solstices where there's leeway of two or three days either side.