Knowledge of Hellenistic, Medieval and Renaissance astronomy would also be useful. Comparing their recorded planetary positions with modern computation reveals that ancient astronomy, especially in the first two time periods, was so off (1-5 degree errors of all planetary positions is average) that they couldn't possibly observe cazimi consistently.
That was a quote from Bonatti.
except that even Lilly specifically says
'....both by latitude and longitude
(which rarely happens)...'
That was a quote from Bonatti.
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