Ω Cap

consists of stars β Cap and α2 Cap: star β Cap being of the third magnitude. The goat's hind foot consists of stars ψ Cap and ω Cap. Both of these stars

P(A)=\sum _{n}P(A\cap B_{n})=\sum _{n}P(A\mid B_{n})P(B_{n}).} where the events ( B n ) {\displaystyle (B_{n})} form a countable partition of Ω {\displaystyle

solid angle, and with apex angle 2θ, is the area of a spherical cap on a unit sphere Ω = 2 π ( 1 − cos ⁡ θ )   = 4 π sin 2 ⁡ θ 2 . {\displaystyle \Omega

then A ∩ B ∈ P . {\displaystyle A\cap B\in P.} That is, P {\displaystyle P} is a non-empty family of subsets of Ω {\displaystyle \Omega } that is closed

sphere: Ω = A r 2   sr = 2 π h r   sr , {\displaystyle \Omega ={\frac {A}{r^{2}}}\ {\text{sr}}\,={\frac {2\pi h}{r}}\ {\text{sr}},} where Ω is the solid