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]

Diagram of the Milky Way. The current position of the Solar System shown by an arrow.

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 2 October, 1608.[8] The first observance of the holiday was on 29 September 2016, the 235th Galactic Tick Day.[9] Below is a list of further observances:

GTD numberDateRef
235th29 September 2016[9]
236th26 June 2018[4]
237th21 March 2020[10]
238th15 December 2021[11]

See also

References
  1. "You Should Celebrate Galactic Tick Day, the New Holiday That Spans the Milky Way". Popular Mechanics. 23 August 2016.
  2. MacDonald, Fiona. "Happy Galactic Tick Day! You just moved around the Milky Way". sciencealert.com.
  3. Schramm, Michael (29 September 2016). "What's a galactic tick (and why are we celebrating it today?)". Michigan Radio.
  4. Sedacca, Matthew (29 September 2016). "Today Is "Galactic Tick Day"!". Nautilus (science magazine).
  5. "Se acerca el Galactic Tick Day ¿Qué se celebra?". Europa Press (news agency) Ciencia Plus.
  6. "'Galactic Tick Day' Celebrates Sun's Trip Around the Galaxy". Space.com. 6 September 2016.
  7. "Strange Science: Earth reaches Galactic Tick Day!". KIAH News Fix.
  8. Gray, Frank. "California man hopes to inspire galactic awe". The Journal Gazette.
  9. Goldstone, Heather. "Galactic Tick Won't Give You Lyme, But Might Make Your Head Spin". WCAI. Retrieved 27 September 2016.
  10. "March 2020 Southworth Planetarium Show Schedule". University of Southern Maine.
  11. @GalacticTick (22 March 2020). "The next Galactic Tick Day is December 15, 2021!" (Tweet) – via Twitter.
External video
Galactic Tick Day from Galactic Tick on YouTube
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