Another Tropical Earth Orbital Period

(Slate::Bad Astronomy) – Phil Plait:

A year, of course, is the time it takes for the Earth to go around the Sun, right? Well, not exactly. It depends on what you mean by “year” and how you measure it. This takes a wee bit of explaining, so if you’re done kicking 2016 to the curb and trying your best to hope for 2017, sit back and let me tell you why we have a new year at all. …

bad_astronomy 2017/01/01 year

Earth tilt

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