I was listening to public radio on the way into work this morning and they were discussion Holst's The Planets. I had always assumed the symphonies were based on astronomy and the nature of the planets, with a combination of the nature of the gods they are named after. Not so. Well... Sort of. The symphonies are based on astrology, with each planet represeting basic human natures/moods. Like Jupiter is jovial (the roman name for Jupiter was Jove, hence jovial (happy or joyous) comes from Jove). And Mars is full of anger and rage.
Learn something new everyday. I think I will need to relisten to Holst's The Planets with this new understanding.