Earth’s aphelion and perihelion
Sometimes the stuff I think about gets me down. I mean, jeez, I think about cynical stuff all the time, and I need to rest my brain sometimes.
When that happens, I sometimes fantasize about really long-term things that happen in the solar system or even the universe. It gives me perspective.
One of my favorite videos to watch at these moments is this one, which always blows my mind. The take-away: nothing is permanent unless there is actually a physical law forcing it to be. Here it is:
p.s. I vote for “tropical year” because I love analemmas.
p.p.s. Looking forward to Vega being the pole star once again.
p.p.p.s. This came up because my husband and I got into a conversation about earth’s aphelion and perihelion and we were wondering if it’s just by chance that perihelion happens near the beginning of winter. The answer is yes, because [take-away above].
p.p.p.p.s. How cool is the name “invariable plane”? And how amazing that the period of the orbiting plane of the earth and the period of the axial tilt are different? There’s really nothing that we can rely on, is there?