(math/round (* 1000000000000.0 (math/atan2 0 1)))
(math/round (* 1000000000000.0 (math/atan2 1 1)))
(math/round (* 1000000000000.0 (math/atan2 1 -1)))
(math/round (* 1000000000000.0 (math/atan2 -1 -1)))
(math/round (* 1000000000000.0 (math/atan2 -1 1)))