If the velocity angle is ln[(1 + √5)/2] ≅ 0.481, what is the condition/parameter?
create table table_15314901_1 (condition_parameter varchar, velocity_angle_η_in_i_radians varchar, PRIMARY KEY (condition_parameter))
select condition_parameter from table_15314901_1 where velocity_angle_η_in_i_radians = "ln[(1 + √5)/2] ≅ 0.481"