Buy Satellite TV
If you are thinking about purchasing a satellite TV for PC software, you may be looking for some information on these types of services. One of the benefits of buying satellite tv is that you can get all the equipment necessary for free in most cases. Many of the top satellite tv providers offer free installation as well to new customers. You will only have to pay for your monthly service and that will not be as big of a bill as it is with cable. Cable is not as affordable as satellite tv and does not always offer as many channels as satellite tv does. Most satellite television providers offer more than two hundred channels for you to chose from.
You can also purchase different packages to fit your needs. If you are a football fan, you may want to sign up for a football package that will give you all the games for the season all in high definition television. You can also get a baseball package or basketball as well. There is not limit to the sporting packages you can purchase. Plus, if you are a foreign sports fanatic you can purchase a package designed for that too. Say if you like English Premiership Football, known as soccer in the United States, you can get a package for that league, or you could get rugby channels from New Zealand or Europe. There is bound to be a sports package suited to you when you buy satellite tv.
Another great thing when you buy satellite tv is that you do not have to lose any of your local programming. All television stations will be available in most satellite tv providers basic plan. Once you have decided on what plans you want, you only need to order the package and your ready to go. You do not have to worry about having another provider for your local channels. With all the options available when you buy satellite tv, and all the free equipment being offered, it just makes sense to call your local provider and get set up with satellite tv.
Miriam Hersh
http://www.articlesbase.com/cable-and-satellite-tv-articles/buy-satellite-tv-749582.html
August 19th, 2011 at 10:45 am
satellite?
why must the centre of satellite orbit coincide with the centre of the earth?
pls provide detailed answers
much appreciate <3
August 19th, 2011 at 3:47 pm
Because the Satellite is working against a force (gravity), whose force is centered within the heavy metallic core of the Earth.
References :
August 19th, 2011 at 3:49 pm
Actually that’s not true.
It is true if the orbit is circular.
But a satellite can have an elliptical orbit, in which case, the earth would be at one of the foci (focuses) of the ellipse.
Look at (search for) both Kepler’s Laws and Newton’s Laws.
References :
Me – I teach this stuff
August 19th, 2011 at 3:51 pm
It doesn’t. Once I tried to place a satellite in a synchronous orbit ,But it wound not stay where we wanted it it stay. It turned out that gravity has mountains and Vallie’s simular to the mountain’s mass below. We had to eventually pick a gravity valley where it would stay for a very long time.
References :
August 19th, 2011 at 3:53 pm
Add angela’s and zabudhar’s answer together, and you have your explanation.
However, in the case of an artificial geosynchronous satellite, the circular argument is valid. Angela explains the more general case of all objects in orbit around a main body.
References :
August 19th, 2011 at 3:55 pm
It’s the "center of mass" of each object that is used to define an orbit.
For all intents and purposes, the center of mass of the Earth is the same as the center of the Earth.
The center of mass for the satellite doesn’t necessarily have to be in the middle of the satellite, but man-made satellites are so small in comparison to the Earth that we can ignore it.
Why is the center of mass so important? This is an over-simplification, but the center of mass is the balancing point for any rigid object or system. If an object is turning free in space, it’s as if it were balancing on an invisible support at that point.
Now on to another point…
If you want to get really technical, the satellite wouldn’t be orbiting exactly around the center of the Earth (we’re assuming a circular orbit here). When you look at the Earth and satellite as a single system, it’s center of mass is at a point between the two. The Earth/Satellite system pivots on this point. Because of the massiveness of the Earth, this pivot point is pretty darn close to the center of mass for the Earth, but it isn’t exactly.
References :
August 19th, 2011 at 3:57 pm
it doesnt
an orbitting system involves the sum of the two masses, and the center of the orbit of the two objects, is in the CENTER OF MASS of the combined two…
if a stellite is small the difference between the mass cernter of the earth and the mass center of the combined two is very small, but exists
lets say the moon-earth system has a bigger difference: "For example, the moon does not orbit the exact center of the earth, instead orbiting a point outside the earth’s center (but well below the surface of the Earth)" http://upload.wikimedia.org/wikipedia/commons/5/59/Orbit3.gif
References :
August 19th, 2011 at 3:59 pm
It doesn’t. Only if the orbit is circular.
References :