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Galactic Tick Day is an awareness and education day that celebrates the movement of the Solar System around the Milky Way galaxy.
The day occurs at a regular interval of 1.7361 years , which is called a galactic tick. The interval is derived from one centi-arcsecond of a galactic year, which is the Solar System's roughly 225-million-year trip around the Galactic Center. One galactic tick is only about 0.00000077 percent ] of a full galactic year.
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