A message from Terry Moseley: "The Autumn Equinox occurs on 22 September at 15h 44m, when the Sun crosses the celestial equator going from North to South. So on this date the length of day and night are equal. Right? Wrong! An honourable mention to whoever gives me the best explanation of why this simple, generalised statement is not true. (Yes, I know I have sometimes quoted that simple conventional statement myself!) BTW, even if the equinox occurred exactly at local noon it still would not be true, and I'm not counting the effects of twilight either. So get your thinking caps on, and let's be hearing from you!"