Galactic Tick Day
Galactic Tick Day is an awareness and education day that celebrates the movement of the Solar System around the Milky Way galaxy.[1][2][3][4]


The day occurs at a regular interval of 1.7361 years (or 633.7 days),[5] 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.[6] One galactic tick is only about 0.00000077 percent (1/[360 × 60 × 60 × 100]) of a full galactic year.[7]
Occurrences
The first Galactic Tick Day took place one galactic tick after Hans Lippershey filed the patent for the telescope on October 2, 1608.[8] The first observance of the holiday was on September 29, 2016, the 235th Galactic Tick Day.[9] Below is a list of further observances:
GTD number | Date | Ref |
---|---|---|
235th | September 29, 2016 | [9] |
236th | June 26, 2018 | [4] |
237th | March 21, 2020 | [10] |
238th | December 15, 2021 |
References
- "You Should Celebrate Galactic Tick Day, the New Holiday That Spans the Milky Way". Popular Mechanics.
- MacDonald, Fiona. "Happy Galactic Tick Day! You just moved around the Milky Way". sciencealert.com.
- Schramm, Michael. "What's a galactic tick (and why are we celebrating it today?)". Michigan Radio.
- Sedacca, Matthew (2016-09-29). "Today Is "Galactic Tick Day"!". Nautilus (science magazine).
- "Se acerca el Galactic Tick Day ¿Qué se celebra?". Europa Press (news agency) Ciencia Plus.
- "'Galactic Tick Day' Celebrates Sun's Trip Around the Galaxy". Space.com.
- "Strange Science: Earth reaches Galactic Tick Day!". KIAH News Fix.
- Gray, Frank. "California man hopes to inspire galactic awe". The Journal Gazette.
- Goldstone, Heather. "Galactic Tick Won't Give You Lyme, But Might Make Your Head Spin". WCAI. Retrieved 27 September 2016.
- "March 2020 Southworth Planetarium Show Schedule". University of Southern Maine.
External links
External video | |
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- Galactic Tick website
- IFLScience.com article about Galactic Tick Day
- Disquiet Junto Project 0248: Galactic Tick musical compositions on SoundCloud
- GalacticTick on GitHub