A galactic year is the time it takes for the Sun to orbit the center of the Milky Way Galaxy. It’s also known as a cosmic year. One galactic year is approximately 230 million Earth years.
The Sun moves at a speed of about 230 kilometers per second, or 500,000 miles per hour. This is enough speed to keep it revolving around the center of the galaxy in a circle, instead of getting pulled toward the black hole.
The Milky Way is a barred spiral galaxy that’s around 13.6 billion years old. Its disk is about 100,000 light-years in diameter and 1000 light-years thick.
One centi-arcsecond of this revolution is called a “Galactic Tick”. A Galactic Tick happens every 633.7 days or 1.7361 years. Galactic Tick Day is set aside to acknowledge the Sun’s motion, our progress around the home galaxy, and to celebrate humanity’s knowledge of this motion.
The last galactic year coincided with September 29, 2016, which happened to be the 235th Galactic Tick Day. The next galactic year would occur 225 million years later, also known as the cosmic year.
What is 1 cosmic year?
about 225 million years
A cosmic year is the time (about 225 million years) needed for the solar system to revolve once around the centre of the Milky Way Galaxy
How old is Earth in galactic years?
In other words, if we were to measure time by this galactic “clock,” Earth would be about 16 years old (in galactic, or cosmic years), the sun would have formed about 20 years ago, and the universe would be just about 60 years old.
The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion yearsto a single year in order to help intuit it for pedagogical purposes in science education or popular science
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Universe discoveries 