True only when the orb is strictly decreasing at the chart instant, judged from the two longitude speeds. False when separating, when exact, and when the relative speed is below STATIONARY_RELATIVE_SPEED; aspectMotion tells the last case apart.
Deviation from exact, in degrees.
True only when the orb is strictly decreasing at the chart instant, judged from the two longitude speeds. False when separating, when exact, and when the relative speed is below STATIONARY_RELATIVE_SPEED; aspectMotion tells the last case apart.