Modeling Velocities

[CresitelloDittmar, Mark]

On Sat, Dec 22, 2018 at 1:40 PM Arnold Rots <arots at cfa.harvard.edu> wrote:

>   if so, is it always EQUATORIAL?
> Usually, but I don't think it needs to be, necessarily; could be converted
> to Galactic, for instance
> Caveat: it can be either specified by separate RA and Dec components, or
> as total PM and a direction (CCW from North)
>
>
You mean a speed + direction given as an angle CCW from the +Dec direction?
(or +b if in Galactic)
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