val pi : float
val pos_infty : float
val degrees_to_radians : float
val radians_to_degrees : float
val deg_cos : float -> float
val deg_sin : float -> float
val deg_acos : float -> float
val deg_asin : float -> float
val intern : string -> string
val fudge_factor : float ref
val set_fudge_factor : float -> unit
val fudge : float -> float