Section 11,12: ATAND

 ATAND (real-number)

 A function that returns the arc tangent of the argument in degrees.
 The value of the argument must be greater than 0.

 +------+---------+----------+------------+-------------+        
 | Args | Generic | Specific |  Argument  | Result Type |
 +------+---------+----------+------------+-------------+
 |   1  |  ATAND  | ATAND    | REAL*4     | REAL*4      |
 |      |         | DATAND   | REAL*8     | REAL*8      |
 |      |see note | QATAND   | REAL*16    | REAL*16     |
 +------+---------+----------+------------+-------------+

 NOTE: QATAND is not available in DEC Fortran.