SLA_CR2AF

Radians to Deg,Arcmin,Arcsec

ACTION:
Convert an angle in radians to degrees, arcminutes, arcseconds (single precision).
CALL:
CALL sla_CR2AF (NDP, ANGLE, SIGN, IDMSF)
GIVEN:

NDP

I

number of decimal places of arcseconds

ANGLE

R

angle in radians


RETURNED:

SIGN

C

‘+’ or ‘

IDMSF

I(4)

degrees, arcminutes, arcseconds, 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 IDMSF(4). On some architectures, 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 a typical 32-bit IDMSF(4).
(3)
The absolute value of ANGLE may exceed 2π. In cases where it does not, it is up to the caller to test for and handle the case where ANGLE is very nearly 2π and rounds up to 360, by testing for IDMSF(1)=360 and setting IDMSF(1-4) to zero.