What is "horometry"

Horometry \Ho*rom"e*try\, n. [Cf. F. horom['e]trie. See Horometer.] The art, practice, or method of measuring time by hours and subordinate divisions. ``The horometry of antiquity.''
--Sir T. Browne.

"measurement of time," 1560s, from Greek hora (see hour) + -metry. Related: Horometrical.

n. The art or practice of measure time by hours and subordinate divisions.

Horometry is the art, practice or method by which time is measured in hours or by smaller units. By this account, a " horometer" is an instrument that measures time.