PM in RA and Dec are essentially derivatives of the RA and Dec taken
in the J2000.0 reference frame (hopefully). Even otherwise, the difference should be small (and "second order"). One must however be aware that this kind of a difference does accumulate over time, but it should still be okay. However, sometimes, this method is called before dec() is actually computed! So, replacing dec() by dec0(). Should backport to 4.10, master. CCMAIL: kstars-devel@kde.org
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