OFFSET
0,1
COMMENTS
Given a right circular cone with polar angle theta, the fraction of the full solid angle it subtends is (1-cos(theta))/2.
LINKS
FORMULA
(1-cos(1))/2 = a243596/(4*Pi).
EXAMPLE
0.22984884706593014129953169627851169813384478969103888616...
MATHEMATICA
RealDigits[(1-Cos[1])/2, 10, 120][[1]] (* Harvey P. Dale, Apr 14 2019 *)
PROG
(PARI) (1-cos(1))/2
CROSSREFS
KEYWORD
AUTHOR
Stanislav Sykora, Jun 07 2014
STATUS
approved