Tag Archives: year


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Time is a measurement of the motion of objects through space.

The planets in our solar system orbit around the sun. One orbit of the Earth takes one year. Meanwhile, our entire solar system orbits the center of the Milky Way galaxy. Our sun and solar system move at about 800 thousand kilometers an hour – that’s about 500 thousand miles an hour – in this huge orbit. So in 90 seconds, for example, we all move some 20,000 kilometers – or 12,500 miles – in orbit around the galaxy’s center.

Our Milky Way galaxy is a big place. Even at this blazing speed, it takes the sun approximately 225-250 million years to complete one journey around the galaxy’s center. This amount of time – the time it takes us to orbit the center of the galaxy – is sometimes called a “cosmic year.”

Revolve means “orbit around another body.” Earth revolves (or orbits) around the sun. The sun revolves around the center of the Milky Way galaxy.

On the other hand, rotate means “to spin on its axis”. The Earth rotates every 24 hours. The sun rotates, but not at a single rate across its surface. The movements of the sunspots indicate that the sun rotates once every 27 days at its equator, but only once in 31 days at its poles.

What about the Milky Way galaxy? Yes, the whole galaxy could be said to rotate, but like the sun it is spinning at different rates as you move outward from its center. At our sun’s distance from the center of the Milky Way, it’s rotating once about every 200 million years – defined by the length of time the sun takes to orbit the center of the galaxy.

If you are an Immortal Spiritual Being, how “old” are you in “Cosmic Years”?    (this is a rhetorical question…)


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Time is relative to the point of view of the observer.  Regardless of your respective definition of a “year”, you are traveling through time in the physical universe, as measured by one or more monitoring systems devised by man to track the motion of particles through space.  Here is a short list of definitions of the word “year”.


(Visualization of the orbit of the Sun (yellow dot and white curve) around the Galactic Centre (GC) in the last GALACTIC YEAR. The red dots correspond to the positions of the stars)

The galactic year, also known as a cosmic year, is the duration of time required for the Solar System to orbit once around the center of the Milky Way Galaxy.[1] Estimates of the length of one orbit range from 225 to 250 million “terrestrial” years.  Solar System is traveling at an average speed of 828,000 km/h (230 km/s) or 514,000 mph (143 mi/s),which is about one 1300th of the speed of light.  If you could travel at that speed in a jet aircraft along the equator, you would go all the way around the world in approximately 2 minutes and 54 seconds.  Even at this speed, it still takes the solar system 230 million years to orbit the center of the Milky Way Galaxy one time.  Hang on and enjoy the ride!

For those who prefer shorter periods of time, here are a list of the Wikipedia definitions of other “years”

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