DonRocks Posted December 27, 2016 Share Posted December 27, 2016 1 hour ago, porcupine said: Do you have a source for this? It doesn't make sense, given that perihelion is in early January and aphelion is in early July. Or does it have something to do with Kepler's second law? I am confused. No, I was writing quickly, and just assumed that the two Equinoxes would be when the Earth was exactly 1 AU away from the sun, but now that you mention it, there's no particular reason I should have assumed this. The 12-hour days have to do with tilt, and not distance. I also assumed that the Winter Solstice was when the Earth was at the maximum AUs from the Sun, and the Summer Solstice was when the Earth was at the minimum AUs from the Sun, but again, these were just automatic assumptions I made without even thinking about it (in fact, it's just about the exact opposite). This is, quite literally, something you learn in freshman science class, if not before (yes, I took Astronomy because it was an easy A). Do you think the 1-AU moments are exactly 3 months away from the perihelion and the aphelion? I couldn't find anywhere that says when they occur, although I did find one webpage that said they did occur exactly twice a year. Link to comment Share on other sites More sharing options...
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