Okay I've always really, really wondered how people get these shots that look like the sky is spinning crazily while the earth is standing still. This is truly incredible, but I'm really trying to figure out HOW.
Thank you very much Well it looks like the sky is spinning crazily and the earth is still, BUT it is actually the other way around. The earth is spinning through space at about 1600 kilometers an hour (at the equator) and the stars are (relatively) still. So any camera (or person) that is on the earth is spinning with the earth at the same rate, so that is why the stars appear to move through the sky and why the sun rises in the east and sets in the west. The rotation or circular effect is due to where the stars are in relation to the earths poles. The best way I can describe it is: stand up straight and imaging that your feet is the south pole and your head the north pole. Look at a spot close to your feet and turn around once. What happens to that spot? It describes a small circle around your feet. Now look at a spot a bit further away from your feet (say a meter or two), and turn again. What happens? It describes a bigger circle. Now look straight ahead at the horizon, and turn again. What happens? The spot describes a straight line around your head. You are seeing the same effect captured on camera here. Stars close to the celestial pole (which is just an extension of the earths poles out into space) make small circles and those further away make bigger circles, and those on the equator (right of the image) form straight lines. Hope that makes sense and that it helps. Cheers
Hope that makes sense and that it helps.
Cheers