時角 is read as じかく (jikaku) and means hour angle.
じかく
jikaku
じこう
becoming invalid or void after a set time
じだいげき
historical play
じせい
(trend of) the times
じき
season
じかんたい
time zone
じだいくぶん
division of history into periods
じかんてき
timewise
じかんがいきょうてい
overtime agreement
じきてき
timing-wise
じかんかんり
time management
すみ
downstage right (on a noh stage)
いっかく
narwhal (Monodon monoceros)