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`pas(`

`al`, `ap`, `bl`, `bp`)

[SOFA] Returns the position angle of b with respect to a.

= longitude of point a in radians, `al`

=
latitude of point a in radians, `ap`

= longitude of point b
in radians, `bl`

= latitude of point b in radians. All
arguments must have the same dimensions, which are also the dimensions
of the result.
`bp`