Originally posted by FabianFnasWell clarke is famous for the geosyncronous orbit but he actually did not originate the idea, it was done decades before, not sure who, I just heard that somewhere. But There are several questions here. I guess the 400,000 km distance question has been answered, it would be a bummer slamming into the moon, eh!. Hmm, so why can't we just connect the earth and the moon with a bloody cable then? You would problably have to have a humungus tower on the north pole instead of the equator but why not? Can you imagine what that would do for the environment of the moon? A friggin highway to the moon. Now there is thought!
Just for information - the Moon is 384,000 km away...
I think the answer has to do with a certain mr Arthur Clarke, the famous Science Fiction writer. Am I right?
Originally posted by oldrunner55Well I doubt it was 1722 since he was born in 1736 but there is no doubt of his greatness as a mathemetician. I don't see any mention of geosynchronous orbits in the Lagrange bio's I read, of course Lagrangian points are attributed to him like you said. Are you going to tackle the questions I raised? What altitude are you on a space elevator where you can step off and be at orbital velocity and what altitude are you on a space elevator where you can step off and be going at least escape velocity?
Actually it was suggested in 1722 by Joseph Louis LaGrange while studying the famous 3-body problem of Newtonian mechanics. The LaGrange points are solutions to Newton's equations of orbital motion where an object of neglegible mas can be placed and stay motionless inreference to the other 2 bodies. There are currently a number of objects at the Langrange points(5) between the Earth and Sun. Checkout the Wikipedia.
Originally posted by oldrunner55You are off about 4000 miles, its 22K miles and change. You may have been thinking about the distance from the center of the earth, THAT is 26K up and we normally think about the distance above the earths surface but all the calculations have to be done from the vantage point of the center of the earth, I think anyway.
You're right of course. It was 1772 my tired fingers doubled up wrong. To your point about the altitude - I believe 26,200 miles would be the orbital point. I'll have to do some thinking about the other though. Some constraints on the construction would seem to be the strength and weight of the cable.
Originally posted by ThudanBlunderAs far as I know, geosync is 22400 above the surface of the earth. Here is an article about it:
In fact, it is 22,236 miles from the centre of the Earth.
Originally posted by ThudanBlunderWell you know it and I know it but I don't see any answers here! PM with yours so you don't spoil the fun!
Yeah, you are right.
It's actually quite easy to work out using Kepler's 3rd Law.
Originally posted by sonhouseThen you have to look harder. We've been discussed the geosync orbits for a while. That's the answer.
Well you know it and I know it but I don't see any answers here!