
$$
{\rm arclength\ } = ({\rm RA_1} - {\rm RA_2}) * \cos({\rm Dec})
$$

Foo bar bar.

$$
{\cos{\gamma}} = \cos(90^\circ - {\rm Dec_1}) \cos(90^\circ - {\rm Dec_2})
           + \sin(90^\circ - {\rm Dec_1}) \sin(90^\circ - {\rm Dec_2})
             \cos({\rm RA_1} - {\rm RA_2})
$$

Bleah bleah bleah.


\eject\bye
