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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: [geda-help] Orientation of components in X-Y (centroid) files
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Date: Fri, 16 Dec 2016 16:10:38 -0500
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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.