| Term: | solar rotation rate |
| Definition: |
(1) synodic: 13.39 degrees -2.7 degrees sin2 J per day (J = solar latitude). (2) sidereal: 14.38 degrees -2. 7 degrees sin2 J per day. The difference between sidereal and synodic rates is the Earth orbital motion of 0.985 degrees/day. |