a. Add angular separation twixt selected object and moon.
b. Add a column in the list for the same.
Developer Analysis
b. will wait for later.
Resolution
Implemented. Also for V1.5.9.
The angular separation of the selected object and the moon is displayed in the Alt-Az indicator (bottom centre). The moon ("M") is displayed as white if it's above the horizon, or black if it's below the horizon.