Galactic Tick Day

{{Use dmy dates|date=December 2021}}

{{Short description|Awareness and education day for the movement of the Solar System}}

{{imageframe

|width=200

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

|content=

{{Superimpose

|base = Milky Way Arms ssc2008-10.svg

|base_width = 220px

|base_alt = Position of the Solar System within the Milky Way

|base_caption = Position of the Solar System within the Milky Way

|float = Yellow Arrow Down.png

|float_width = 16px

|x = 102

|y = 32

}} }}

{{Infobox holiday

| holiday_name = Galactic Tick Day

| type = educational

| duration =

| frequency =

| observedby = international

| date =

| date2023 = 10 September

| date2025 = 5 June

}}

Galactic Tick Day is an awareness and education day that celebrates the movement of the Solar System around the Milky Way galaxy.{{cite web|url=http://www.popularmechanics.com/space/deep-space/news/a22492/galactic-tick-day-september-29|title=You Should Celebrate Galactic Tick Day, the New Holiday That Spans the Milky Way|website=Popular Mechanics|date=23 August 2016}}{{Cite web|url=http://www.sciencealert.com/happy-galactic-tick-day-you-just-moved-around-the-milky-way|title=Happy Galactic Tick Day! You just moved around the Milky Way|last=MacDonald|first=Fiona|date=29 September 2016 |publisher=sciencealert.com}}{{Cite web|url=http://michiganradio.org/post/whats-galactic-tick-and-why-are-we-celebrating-it-today|title=What's a galactic tick (and why are we celebrating it today?)|last=Schramm|first=Michael|website=Michigan Radio|date=29 September 2016}}{{Cite web|url=http://nautil.us/blog/today-is-galactic-tick-day|title=Today Is "Galactic Tick Day"!|last=Sedacca|first=Matthew|date=29 September 2016|website=Nautilus (science magazine)|access-date=1 October 2016|archive-date=21 March 2020|archive-url=https://web.archive.org/web/20200321060102/http://nautil.us/blog/today-is-galactic-tick-day|url-status=dead}}

The day occurs at a regular interval of 1.7361 years (or 633.7 days),{{cite news|url=http://www.europapress.es/ciencia/astronomia/noticia-acerca-galactic-tick-day-celebra-20160906172126.html|title=Se acerca el Galactic Tick Day ¿Qué se celebra?|agency=Europa Press (news agency) Ciencia Plus}} 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.{{cite web|url=http://www.space.com/33963-holiday-celebrates-suns-orbit-around-the-galaxy.html|title='Galactic Tick Day' Celebrates Sun's Trip Around the Galaxy|website=Space.com|date=6 September 2016}} One galactic tick is only about 0.00000077 percent (1/[360 × 60 × 60 × 100]) of a full galactic year.{{cite news|url=http://cw39.com/2016/09/28/earth-reaches-galactic-tick-day/|title=Strange Science: Earth reaches Galactic Tick Day!|agency=KIAH News Fix}}