Assertion: mercury's motion | /r/HasProperty | six degrees per day
Facets:
value: at aphelion
type: LOCATION
Source sentences:
text: So at aphelion the westward motion of the stars is still six degrees per day, and the Sun's motion, which is that six degrees minus the apparent orbital motion, is a little over three degrees per day to the west, or more than 50% faster than normal.