Every time the Earth makes one complete loop around the sun, humans celebrate the journey with some kind of New Year's holiday. So why won't we celebrate every time our solar system completes one loop around the center of the galaxy? Such a holiday may have just arrived: A group of science enthusiasts have established "Galactic Tick Day," which celebrates the journey that the sun takes around the nearly circular disk of the Milky Way galaxy. Unfortunately, the sun completes one galactic circuit about 220 million to 250 million years. To make the holiday more compatible with human lifetimes, the creators of Galactic Tick Day divided the sun's journey up into smaller chunks, so that the holiday ...
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