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gjrk wrote:
Gotta admit I find him hard going even now (Albert), short bursts only :)

Do you know, I'll keep what you've suggested in mind next time I look at local orientations. Might be nothing in it, but then...

Burst is appropriate .

The problem is really the dates and that is what makes WKLB interesting as it coincides with the construction. The alternative is to find a monument with all the suitable azis and decs which is is likely if you have a few centuries to play about with but is it likely to have been the date of build , we don't know because rarely do we have such accurate dates .

The usual idea, you'll have to correct me if I'm wrong, is observation of an annual 'alignment' to winter/summer sol. etc., then construction of the monument on the correct axis? Could this be different; observation of one spectacular event and one monument to mark the same? Or how soon would something similar, with all those factors, be likely to happen? Though if, as you suggested, you're waiting 18.6 years for something you're not going to be able to see anyway...