Galactic Tick Day

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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.[1][2][3][4]

Galactic tick[edit]

Position of the Solar System within the Milky Way
Diagram of the Milky Way with the position of the Solar System marked by a yellow arrow

The day occurs on 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 .0000077 (1/360*60*60*100) percent of a full Galactic year.[7]

Galactic Tick Day[edit]

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] The second observance was on June 26, 2018.[4]

See also[edit]


  1. ^ "You Should Celebrate Galactic Tick Day, the New Holiday That Spans the Milky Way". Popular Mechanics.
  2. ^ MacDonald, Fiona. "Happy Galactic Tick Day! You just moved around the Milky Way".
  3. ^ Schramm, Michael. "What's a galactic tick (and why are we celebrating it today?)". Michigan Radio.
  4. ^ a b Sedacca, Matthew (2016-09-29). "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".
  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.

External links[edit]

External video
Galactic Tick Day from Galactic Tick on YouTube