Nearly a quarter of Americans still believe in Ptolemy's idea that the sun goes around Earth. Yet, every year, these people presumably cheer on December 31 to mark the New Year, another successful trip of Earth around the sun. It's likely not hypocrisy, just ignorance.
But if much of the general public still doesn't get heliocentrism, then it seems likely we'll have to wait a long while until people accept the more awe-inspiring fact that it's not just the planets that revolve about the sun—the whole solar system itself revolves about the black-hole center of the Milky Way: one round-trip taking approximately every 225 million years.
To accelerate awareness of our solar system's intragalactic journey, David Sneider, a 26-year-old software entrepreneur in San Francisco, along with three of his colleagues, founded "Galactic Tick Day." Today, September 29, marks our most recent completion of a "galactic tick," or one centi-arcsecond of our solar system's galactic revolution. Celebrating this, he says, "can be perspective shifting."
The paths the sun and planets of our solar system take as they revolve around the galaxy.Rhys TaylorDespite our advances in space, much of people's everyday thinking about the wider cosmos and its…
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