SpiceDouble pi_c ( void )
Return the value of pi (the ratio of the circumference of
a circle to its diameter).
The function returns the value of pi.
The function returns the value of pi (the ratio of a circle's
circumference to its diameter), determined by the ACOS function.
pi_c = acos ( -1.0 );
The first time the function is referenced, the value is computed
as shown above. The value is saved, and returned directly upon
The code fragment below illustrates the use of pi_c.
Compute the polar radius,
1 + e cos(theta)
at evenly spaced values of the polar angle, theta.
delta = pi_c() / n
for ( i = 0; i < n, i++ )
r[i] = p / (1.0 + ecc * cos( i * delta) );
E.D. Wright (JPL)
W.L. Taber (JPL)
I.M. Underwood (JPL)
-CSPICE Version 1.0.0, 08-FEB-1998 (EDW)
value of pi