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Re: Satellite to the south
[Re: JohnandBev]
#43922
03/06/2015 07:41 PM
03/06/2015 07:41 PM
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Joined: Jul 2006
Posts: 13,436 Peaceful Eastern North Carolin...
GaKaye
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JohnandBev said: Space station? Does it twikle red and green, about 1/4 up on the horizon and a little to your left? [image you are in Maho at La Plage J&B Yes! That's the space station? Edited to add: I just looked this up online, and I doubt it's the space station, as what I see doesn't move...ever. The space station moves across the sky.
Last edited by GaKaye; 03/06/2015 07:58 PM.
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Re: Satellite to the south
[Re: GaKaye]
#43925
03/06/2015 09:09 PM
03/06/2015 09:09 PM
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Joined: Jul 2013
Posts: 837 Florida
wilsonck
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It has to be something Geostationary, otherwise it set and rise in the sky depending on time.
Last edited by wilsonck; 03/06/2015 09:16 PM.
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Re: Satellite to the south
[Re: soualigacapt]
#43931
03/07/2015 09:26 AM
03/07/2015 09:26 AM
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Joined: Jun 2005
Posts: 1,146 Louisiana
o2bnsxm
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soualigacapt said: Anything in the sky will change its position in the sky as the hours pass. Unless it's attached to earth. Geostationary things will move across the sky as the earth revolves. If it's a star it would VERY ( not really noticeably day to day) slowly change it's position as the earth rotates around the sun and our view of the heavens changes in each season. That's why you see it every year at the same time in the same place. Next time you see Orion, look lower and to the left for a very bright Star and look with binoculars and you will see Sirius twinkling in red green and white very distinctly. Orion is probably gone from the sky by this times of the year. Look next winter. Does that include satellites (for tv, communications, etc)? It seems that if they did move across the sky, the "dish" that picks up the signal would not be pointing in the right direction to receive the signal. My TV cable "dish" is pointed up to the southwest sky to pick up the signal, but it is stationary and does not move to track a signal.
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Re: Satellite to the south
[Re: boucharda]
#43933
03/07/2015 11:56 AM
03/07/2015 11:56 AM
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Joined: Jun 2005
Posts: 1,146 Louisiana
o2bnsxm
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Louisiana
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boucharda said: Read the post above yours.... Thanks, We were typing at the same time, apparently my old fat fingers weren't moving as fast as his young nimble ones. <img src="http://www.traveltalkonline.com/forums/images/graemlins/jester.gif" alt="" />
Last edited by o2bnsxm; 03/07/2015 11:57 AM.
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Re: Satellite to the south
[Re: mrsunshine]
#43934
03/07/2015 01:03 PM
03/07/2015 01:03 PM
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Joined: Aug 2000
Posts: 2,628 Southern Maryland suburbs of D...
Bill_S
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mrsunshine said: Geostationary satellites orbit the earth at the same rate as the earth rotates. They do not move position viewed from the ground. That is why they are used for all GPS devices. If they moved there would be no GPS devices. Just GOOGLE geostationary for details. Actually the GPS satellites are not Geostationary. They are in orbits at one-half the geostationary altitude. Here is a link to the explanation: GPS.gov It is mainly communications satellites that are in a geostationary orbit that exactly matches the speed of the earth's rotation so they remain above the same spot on the earth.
Bill
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Re: Satellite to the south
[Re: soualigacapt]
#43936
07/20/2015 07:53 AM
07/20/2015 07:53 AM
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Joined: Aug 2000
Posts: 2,628 Southern Maryland suburbs of D...
Bill_S
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Actually it is the stars that appear to move across the sky as the earth rotates. Back in the days of film cameras I set up a Minolta 35mm SLR on a tripod next to my huge 10 ft satellite TV dish and pointed it at the same area of sky as the dish with a normal lens on a clear, moonless night. I used a cable shutter release that allowed me to hold the shutter open for several minutes for a long time exposure.
I took several time exposures over a couple hours, experimenting with diferent exposure times.
When the film was developed and printed I had several photos that showed the stars as curved streaks (rotating around Polaris...the North Star...) and a string of dots arcing across the sky in a line.
The dots were the geostationary satellites, made visible by the long exposure times and the sunlight bouncing off their shiny surfaces. It was a neat experiment.
Bill
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Re: Satellite to the south
[Re: CaribLee]
#43938
07/20/2015 09:27 AM
07/20/2015 09:27 AM
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Joined: Aug 2000
Posts: 2,628 Southern Maryland suburbs of D...
Bill_S
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My guess is that you are seeing the planet Venus. It is the brightest planet in our solar system because it is much closer to the sun than earth and has a very cloudy atmosphere which reflects sunlight very well.
If you only see one light in the sky shortly after sunset and in the same general direction it is nearly always Venus. Poets often refer to Venus as the "Evening Star", although it is not a star.
Bill
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Re: Satellite to the south
[Re: GaKaye]
#43940
07/20/2015 10:02 AM
07/20/2015 10:02 AM
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Joined: Aug 2000
Posts: 2,628 Southern Maryland suburbs of D...
Bill_S
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Actually that is a trick of the atmosphere as the light passes through it. The light refracts slightly as it passes through the dust and moisture in the upper atmosphere causing the apparent glints of color. I worked in the space arena for decades both in the Air Force and in Industry and none of the satellites flash color on purpose...and most birds are covered with reflective gold mylar as needed for thermal control where they are not either black or white in color. Go outside and look around on a dark moonless night. You will often see stars and planets appear to flash colors as the white light passes through the atmosphere. The effect seems to get more pronounced nearer to the horizon, since the light passes through more of the atmosphere for a longer time at low elevation angles.
Bill
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Re: Satellite to the south
[Re: GaKaye]
#43945
07/20/2015 08:37 PM
07/20/2015 08:37 PM
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Joined: Sep 2014
Posts: 334 Pittsburgh, PA
jerber160
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does anyone use the skyview app? love it... if you focus the circle on what you want to see, it identifies it... above and below the horizon! so if you point it at a dot, it could be the space station.... or a star in what constellation... very fun
Last edited by jerber160; 07/20/2015 08:39 PM.
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