  Achieving sub-arcsecond co-registration across varying time-lines of
multi-wavelength and instrument images is not trivial, and requires accurate
characterization of instrument pointing jitter. In this work we have
investigated internal pointing errors, on daily and yearly time-scales,
occurring across the \textit{Solar Dynamics Observatory}'s (SDO) {\it
Atmospheric Imaging Assembly} (AIA) and { \it Helioseismic Magnetic Imager}
(HMI). Using cross-correlation techniques on AIA 1700\,{\AA} passband and HMI
line-of-sight (LOS) magnetograms, from three years of observational image pairs
at approximately three day intervals, internal pointing errors are quantified.
Pointing variations of $\pm$\,0.26$\arcsec$ (jitter limited) and
$\pm$\,0.50$\arcsec$ in the solar East-West ($x$) and North-South ($y$)
directions, respectively, are measured. AIA observations of the Venus June 2012
transit are used to measure existing coalignment offsets in all passbands. We
find AIA passband pointing variations are $< \Delta X_{CO} >$\,$=$\,
1.10$\arcsec$\,$\pm$\,1.41$\arcsec$ and $< \Delta Y_{CO} >$\,$=$\,
1.25$\arcsec$\,$\pm$\,1.24$\arcsec$, when aligned to HMI's nominal image
center, referred to herein as the CutOut technique (CO). Minimal long-term
pointing variations found between limb and correlation derived pointings
provide evidence that image center positions provided by the instrument teams
achieve single pixel accuracy on time-scales below their characterization.
However, daily AIA passband pointing variations of $\lesssim$\,1.18$\arcsec$
indicate autonomous sub-arcsecond co-registration is not yet fully achievable.
