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`seps(`

`lon1`, `lat1`, `lon2`, `lat2`)

[SOFA] Returns the angular separation in radians between the direction
with longitude

(radians), latitude `lon1`

(radians) and the direction with longitude `lat1`

(radians), latitude `lon2`

(radians). All arguments must
have the same dimensions. The result has those same dimensions, too.
`lat2`