Re: No Moon
I'd agree with all that's been said. Except that I did hear recently that they now suspect the moon may not be as stabilising an influence on our axial tilt as had been thought. I believe the rest of the planets have an equally stabilising effect.
How to say there's no moon when they've never seen one? How about there was a moon in antiquity. They have legends describing it and a legend of one of their gods murdering another god (the moon) or stealing it from another god or... well you get the idea!