They used sundials or shadow clocks to measure the time of day.
(They; used; sundials or shadow clocks; to measure the time of day) Context(They used,List([0, 9))):(They; used sundials or shadow clocks to measure; the time of day)
They used,List([0, 9))
They They
used used sundials or shadow clocks to measure
sundials or shadow clocks to measure the time of day
the time of day