Agreed this is arbitrary.  Why not divide into 2*pi units and divide from there.  Been a long time since I touched orbital stuff, but maybe add a &quot;normalization&quot; that factors in the Kepler area carved out by an object in orbit around the galactic center (tho... I&#x27;m not sure how well Kepler works in the galactic rotation sense... but something similar perhap?) In any case, if the orbit isn&#x27;t circular, something would need to adjust for the change in relative angular rotation.<p>Also... may want to standardize on reporting this in terms of &quot;seconds&quot; and dropping &quot;days&quot; and other locally referenced time measures :-)