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 (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 0.00000077 percent (1/[360 × 60 × 60 × 100]) of a full galactic year.
Occurrences The Galactic Tick Day was retroactively calculated to begin on the day Hans Lippershey filed the patent for the telescope on 2 October 1608. The first observance of the holiday was on 29 September 2016, the 235th Galactic Tick Day. Below is a list of further observances:
GTD number Date Ref 1st 2 October 1608 235th 29 September 2016 236th 26 June 2018 237th 21 March 2020 238th 15 December 2021 239th 10 September 2023 240th 5 June 2025 241st 1 March 2027 242nd 24 November 2028 243rd 20 August 2030
See also Astronomical chronology Chronology Cosmic Calendar
References
External links
Galactic Tick website IFLScience.com article about Galactic Tick Day Disquiet Junto Project 0248: Galactic Tick musical compositions on SoundCloud GalacticTick on GitHub