19 Apr '22 11:48>3 edits
The sun orbits the galaxy and takes around 230 million years to do. At nearly 900,000 km per hour. Why then do the stars appear in the same exact position in our sky year after year?
Wouldn't you expect that stars like the North Star would stop appearing directly above earth's rotational axis? Yet, for centuries, the North Star (Polaris) is reliably in the same spot, which is why sailors have always been able to use it as a guide.
But if the sun is orbiting the galaxy, shouldn't that movement cause Polaris' position relative earth to change? Shouldn't some constellations start to appear either further or closer over time due to the sun's orbit?
Is it that the distances are so vast that even the sun's orbit around the galaxy doesn't affect the apparent positions of stars? Or do all the stars orbit together at the same rate in a way that keeps their proximities to earth constant?
Thank you to anyone who can clear this up for me.
Wouldn't you expect that stars like the North Star would stop appearing directly above earth's rotational axis? Yet, for centuries, the North Star (Polaris) is reliably in the same spot, which is why sailors have always been able to use it as a guide.
But if the sun is orbiting the galaxy, shouldn't that movement cause Polaris' position relative earth to change? Shouldn't some constellations start to appear either further or closer over time due to the sun's orbit?
Is it that the distances are so vast that even the sun's orbit around the galaxy doesn't affect the apparent positions of stars? Or do all the stars orbit together at the same rate in a way that keeps their proximities to earth constant?
Thank you to anyone who can clear this up for me.