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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.
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Galactic tick
The day occurs on a regular interval of 1.7361 years (or 633.7 days), 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 .0000077 percent of a full Galactic year.
Galactic Tick Day
The first Galactic Tick Day took place one Galactic tick after Hans Lippershey filed the patent for the telescope on October 2, 1608. The first observance of the holiday was on September 29, 2016, the 235th Galactic Tick Day. The second observance will occur on June 26, 2018.
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Galactic Tick Day Wikipedia(Text) CC BY-SA