離角 is read as りかく (rikaku) and means elongation.
りかく
rikaku
しんきんてんりかく
true anomaly
きんてんりかく
anomaly
はなれる
to leave
りこん
divorce
りりく
takeoff
はなす
to separate
りとう
secession from a political party
りだつ
withdrawal
leaving an island
りはん
estrangement
りちゃくりく
takeoff and landing
りしょく
employment separation