Dear dialists, Yes, I know this is old hat, but does anybody know how could Hipparcus know the longitude of a tropical year with a 4-digit precission? More generally, which is the highest accuracy one can expect from naked-eye observations to equinoxes, solstices, NSEW points, and so on... Is it true that some egyptian temples are aligned up to the arc-minute or is it just science-lore?
Regards, Anselmo -
