I am still interested in the definition of the hour and the minute and when
they became a fixed/defined period. The following from another
list: Comments? Corroboration?
A unit of time of which 24 comprise a Solar Day. The Egyptians were the
first to so divide the day, although the lengths of each of the hours in a
day was not a fixed number to the Egyptians and changed with the seasons.
In their investigation of theoretical astronomy, the Greeks used
"equinoctial" hours of equal length, and divided these hours into 60
Minutes (Neugebauer 1969).
References
Neugebauer, O. The Exact Sciences in Antiquity, 2nd ed. New York: Dover,
pp. 81, 1969.