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How would a three hour time exposure photograph of Star in the norther sky appear if the earth didn't rotate?
Wiki User
∙ 9y ago
If the Earth didn't rotate, then the camera would stay where you pointed it, and a three hour exposure would look just like a 1/60 second exposure except that everything would be a lot brighter.The fact that the Earth does rotate is a problem in astrophotography. To get long exposures, it's necessary to mount the telescope on a motorized base turning in the opposite direction to counteract the rotation of the Earth and keep the camera pointed at the same star for the entire length of the exposure ... if you don't, you get "trails" as the stars move across the camera's field of view. (Though really it's the camera that's doing most of the moving ... the stars are moving, but they're so far away that it takes a lot more than three hours for them to move noticeably.)
Wiki User
∙ 9y ago
Wiki User
∙ 9y agoThe simple answer would be that the stars would all be in the same place, because the Earth wasn't rotating.
A more thorough answer would be "EVERYTHING is rotating, so if you say "not rotating", you're saying 'not rotating as compared to some other object'".
And, if the Earth wasn't rotating, all the atmosphere would freeze and condense on the night side of the planet. We'd all die.
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How would a three hour time exposure photograph of stars in the northern sky appear if earth did not rotate?
The stars would be brighter points of light. Without the Earth's rotation, the Earth would not be moving enough to create the lines of light that ordinarily appear in an uncorrected stationary time exposure. Depending on the clarity of the sky, the entire image could be grayed by scattered light (light pollution).
How would a three-hour time exposure photograph of stars in the northern sky appear if earth did not rotate?
The stars would be brighter points of light. Without the Earth's rotation, the Earth would not be moving enough to create the lines of light that ordinarily appear in an uncorrected stationary time exposure. Depending on the clarity of the sky, the entire image could be grayed by scattered light (light pollution).
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How would a three hour time exposure photo of stars in the northern sky appear if the earth did not rotate?
The photograph would record far more stars, nebulae, and galaxies than the naked eye could see. There are many thousands of such photographs to be seen on the web. Any camera capable of long exposures with an equatorial mount and a clock drive could create such a photograph. A clock drive, which turns the right ascension axis of the mount at the speed of a hour hand (hence the name), counteracts the rotation of the Earth.
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