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Cool beans.
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neither are they geodesic.
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Orbits
GPS Satellites operate in a Mid-Earth Orbit, approximately 1/2 of the height of the satellites shown in UT's pic. This type of orbit allows for better GPS service near the polar regions of the Earth.
<-- doesn't play the "dumb" game :D |
8.5 hours; the photographer must have steady hands.
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Undertoad, I didn't mention this before, but this IotD is a great one. Good job!
It has slowly grown on me over the last couple days. I was mulling over the possibility of taking a similar image myself. I wonder what sort of equipment you need? The link says it was taken at Kitt Peak, but not which instrument was used. I wonder if it was one of the big telescopes there, or just a camera on a tripod with a long exposure? The satellites are +10 to +14 magnitude in brightness, but I don't know exactly what that means in camera exposure speak. Eight hours is a long exposure. Looking at the link again, it says the view spans about 10% of the arc. That's roughly like a 50mm lens. You should be able to reproduce this shot in your back yard with a 35 mm camera on a tripod! (assuming a clear night.) Cool. |
Wouldn't you get too much light pollution there in Arlington?
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Yeah, way too much here. I can see the planets and the moon though.
But you know, when you travel to someplace nice and have a clear night, you can do this. |
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