SUBROUTINE sla_CR2TF (NDP, ANGLE, SIGN, IHMSF) *+ * - - - - - - * C R 2 T F * - - - - - - * * Convert an angle in radians into hours, minutes, seconds * (single precision) * * Given: * NDP int number of decimal places of seconds * ANGLE real angle in radians * * Returned: * SIGN char '+' or '-' * IHMSF int(4) hours, minutes, seconds, fraction * * Notes: * * 1) NDP less than zero is interpreted as zero. * * 2) The largest useful value for NDP is determined by the size of * ANGLE, the format of REAL floating-point numbers on the target * machine, and the risk of overflowing IHMSF(4). For example, * on the VAX, for ANGLE up to 2pi, the available floating-point * precision corresponds roughly to NDP=3. This is well below * the ultimate limit of NDP=9 set by the capacity of the 32-bit * integer IHMSF(4). * * 3) The absolute value of ANGLE may exceed 2pi. In cases where it * does not, it is up to the caller to test for and handle the * case where ANGLE is very nearly 2pi and rounds up to 24 hours, * by testing for IHMSF(1)=24 and setting IHMSF(1-4) to zero. * * Called: sla_CD2TF * * P.T.Wallace Starlink 18 March 1999 * * Copyright (C) 1999 Rutherford Appleton Laboratory *- IMPLICIT NONE INTEGER NDP REAL ANGLE CHARACTER SIGN*(*) INTEGER IHMSF(4) * Turns to radians REAL T2R PARAMETER (T2R=6.283185307179586476925287) * Scale then use days to h,m,s routine CALL sla_CD2TF(NDP,ANGLE/T2R,SIGN,IHMSF) END