Celestia Forums

Heres a feature which would be a nice addition to the verbose HUD..

Would it be possible to have two extra readings added- one showing the speed of the observer moving through space (following the Shuttle etc), and the other showing the relative speed of another object (the Earth below), if one was selected.

I know there is already a "speed" reading, but this is only if you're manually flying through space.

For things like the voyager flybys, you could see how gravity boosts affected the speed of the spacecraft, etc.

Good idea? It might be very hard to impement of course, i don't know...

That would be a simple vector subtraction, if Celestia used velocity vectors. However, I'm pretty sure the positions of objects are specified explicitly. .xyz files, for instance, are just a list of time/position pairs.

Of cource, it wouldn't be too hard to approximate...

- a b i o g e n e s i s -

JackHiggins wrote:one showing the speed of the observer moving through space (following the Shuttle etc), and the other showing the relative speed of another object (the Earth below), if one was selected.

relative speed would be nice. however, there is no such thing as speed compared to space. there is no main coordinate system. the only possibility to measure the speed relative to some other objects.

pint wrote:relative speed would be nice. however, there is no such thing as speed compared to space. there is no main coordinate system. the only possibility to measure the speed relative to some other objects.

I was thinking of speed compared to the sun/whatever other star it's orbiting around...? since stars in celestia don't move, and the galaxy doesn't either, this would be a good thing to measure from?!

Relative speed to the current selection for example !