Hi Oliver,

I am thinking about some sort of separation between "planets"
and "natural satellites", but haven't quite decided how I'll go about
this. I may also revise Guide so that planets are shown if they
meet the magnitude limit criterion, _or_ if they would show a disk
(more than one pixel) on-screen. Thus, the disk of the moon
occulting the sun would always appear, and you'd evade the
oddity of seeing the moon vanish near total eclipse (and Mercury
and Venus vanishing near transit).

-- Bill