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Subject: Re: [geda-help] Orientation of components in X-Y (centroid) files
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On Fri, 16 Dec 2016, DJ Delorie wrote:

>
> This is something typically "fixed" by the assembly houses that know
> which way the parts are on the tape and reel, but...
>
> PCB uses pin 1 (and sometimes pin 2) to determine the angle.  IIRC there
> are specs for how to determine angle too, but I don't remember what they
> are.
>

IPC7351, page 16

It tries to specify what pin1 is and says pin1 should be to the top-left 
(compared to the ceontroid) at 0 degree rotation.