Celestia Forums

I have a small SSC file to define an OrbitFrame for the Earth-Sun L1 location. The question is, where do I put this? I would rather avoid putting it in the global data directory if possible, having put it there and then lost it when I installed a new version of Celestia. Does Celestia search any use...

I'm not sure if this question belongs in scripting, but since that's what I was trying to do when I ran into the question.... I was sitting down to calculate positions for a trajectory based on the solarsystem_tour script (which is basically calculate every position "by hand" in the script...

I'm trying to figure out how to execute a particular trajectory through space. I found the XYZBuilder script, but it doesn't seem to work with Celestia 1.5.0 on Linux. Each time I hit entery, I'm prompted for a target which was not expected. Even if I answer the prompts, after I've done more than th...

First, thank you for a very lucid explanation of what was wrong with my frame. It helped me to better understand frame definitions in general. I replaced Sol/Earth with Sol in each case, and further adjusted to make the z-axis "up" wrt to the ecliptic. When I "goto" this location...

I thought this should rotate, but... "Earth North Hover" "Sol/Earth" { Class "Invisible" Radius 0.001 OrbitFrame { TwoVector { Center "Sol/Earth" Primary { Axis "z" RelativePosition { Target "Sol/Earth" } } Secondary { Axis "y" Re...

It's also important to keep in mind that the frame you defined is rotating: the principal direction is the Earth-to-Moon vector at the current time. Here's an image that I made some time ago that depicts a TwoVector frame extremely similar to yours, except with the Sun-Earth instead of the Earth-Mo...

track jumps, center slews gradually. I want the smooth motion effect. I can, in principle, do this with the long form of goto, but it is a lot more work since you have to use positions instead of objects. And as the manual points out, doing a goto on an object position is not the same as doing a got...

It's also important to keep in mind that the frame you defined is rotating: the principal direction is the Earth-to-Moon vector at the current time. Here's an image that I made some time ago that depicts a TwoVector frame extremely similar to yours, except with the Sun-Earth instead of the Earth-Mo...

Yes, I know about wait. What I'm actually doing right now is obs:goto(L1) while obs:travelling() do wait(0.25) end obs:center(moon) but that's not simultaneous which is what I was asking. It would be nice to be able to both move and orient at the same time. I guess I need to post on the feature requ...

I'm trying to get a reference frame to show the Lunar Libration. I'm 99% of the way there with this: "LEO Moon Track" "Sol/Earth" { Class "Invisible" Radius 0.001 OrbitFrame { TwoVector { Center "Sol/Earth" Primary { Axis "x" RelativePosition { Targe...

It would seem that I can't do obs:goto(object) obs:center(other_object) When I attempt to do so, the goto is interrupted and does not complete. This is celestia 1.5.0. Is this normal behavior? Is there a way to do both at the same time? What I'm trying to do is smoothly change both my location and m...

I have this in a file in extras to define the Earth-Moon L1 point: "Moon-L1" "Sol/Earth/Moon" { Class "Invisible" Radius 0.001 OrbitFrame { TwoVector { Center "Sol/Earth/Moon" Primary { Axis "x" RelativePosition { Target "Sol/Earth" } } Sec...

Does anyone know what their custom add-on is or where it can be retrieved? I'm trying to figure out of the site is at all usable....

I'd like to run a simulation showing the solar system geometry that gives rise to both phases for Mercury and Venus, and retrograde motion for the other planets. To do, this, it would be very useful to be able to have two views with different observers (different viewing locations) but time synchron...

I'm writing a script to display a split-view of Venus' phases. One pane looks at Venus with a wide-angle view so the Sun is also always visible, the other pane shows a telescopic view so that both the size and phase changes are visible. To get this to work, I have to define a new reference frame. I ...

I'm looking for an explanation of the cause of the lunar orbit precession. Something like a force diagram showing the origin of the torques that are the origin of the draconic month. Anyone know of such a place? Even a textbook I could get my hands on?

I want to do a simulation showing the orbit of the earth and moon and the geometry that causes eclipses. To do this, it's helpful to turn on orbits. But having every planet and moon orbit turned on is distracting. It doesn't look like there is any way to only turn on some orbits (in my case, just th...

Perfect! Thanks!

I'm running into this as a problem. I'm putting together a tutorial on eclipses for the upcoming Feb 20 lunar eclipse and noticed that as I run time forward and backward at high rates to show the past few years of eclipses, that the moon quickly leaves its nominal orbit. Stopping time and turning on...

Hmm, I'm running 1.5.0 final that I build on a Fedora Core 8 system. Both K and k divide the speed by 2 and both L and l increase it by a factor of 2. I can't get factors of 10 any more.

Is there a config file someplace that might be affecting that?