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Hey all, Have given Agendus a bit of a spin for the past couple of days, and I like what it does. It is extremely handy in that it does essentially what I wanted my PDA to do in the first place ... manage contacts and appointments (whilst still using the native PIM DBs!!) ... but I won't bore...

What is the significance of Arctic Circle and the Antarctic Circle as they relate to the length of daylight during the year? What is the relationship between the sun's angle of insolation and temperature? How does the tilt of the Earth's axis affect the length of daylight? What is a lunar cycle?