Hey Granpafishy,
I had started to make a document a while back about how to describe a planet to players, but I think I got bogged down somewhere and didn't work on it for a while. I figured out that there's 5 basic descriptors.
Later,
Scout
OUT OF ATMOSPHERE PHENOMENA
Suns, Planets and Moons, Meteors and Comets, Stars, Nebulae, and Constellations, Eclipses and other Stellar Happenings, and Artificial Objects
TIME
Time of Day (Local Time), Date, Length of Day, Time of Year, and Seasons
ATMOSPHERIC CONDITIONS
Breathe-ability, Weather, Temperature, Sounds, Scents
GROUND CONDITIONS
Gravity, Geography & Geology (Earthquakes & Volcanoes), Flora & Fauna
PEOPLE AND TECHNOLOGY
People, Tools, Vehicles, Structures, Food, Goods, Entertainment