Celestia Forums

Hy, it's me again

Here is few more questions:

1. What is all about those Locations, i'v downloaded few files (like earthcities.ssc, marslocations.ssc) but I cant figure out how to use them. Maybe there is some specific folder for them, or maybe they can be used only in newer versions than mine is (1.3.0) ?

2. Is there an easy way to make flat nebulas look at the Earth direction ? Is there any mathematic formula or smth. to calculate Axis and Angle values depending of nebula position in the sky ?

3. Similar to previous one, but same problem about XYZ values, is there any way, or maybe third-party soft. to SEE object coordinates at precise time by just seting up orbit elements ?

Thank You for your answers...

JimBim wrote:Hy, it's me again

Here is few more questions:

1. What is all about those Locations, i'v downloaded few files (like earthcities.ssc, marslocations.ssc) but I cant figure out how to use them. Maybe there is some specific folder for them, or maybe they can be used only in newer versions than mine is (1.3.0) ?

Just put all locations files into extras folder, run Celestia and go to the planet. To see them you may press &. You must be close to the surface (~ few thousand km), to change locations option go render/location menu.

2. Is there an easy way to make flat nebulas look at the Earth direction ? Is there any mathematic formula or smth. to calculate Axis and Angle values depending of nebula position in the sky ?

Yes.

Grant Hutchison has provides a spreadsheet calculator that does most of the hard work. See http://www.lns.cornell.edu/~seb/celestia/hutchison/dsc-spreadsheet.html

Unfortunately, most astronomical photographs are not aligned north-south, so they still need to be rotated. See http://www.lns.cornell.edu/~seb/celestia/billboard.html#6.0

3. Similar to previous one, but same problem about XYZ values, is there any way, or maybe third-party soft. to SEE object coordinates at precise time by just seting up orbit elements ?

Yes.

Use the Horizons ephemeris service at http://ssd.jpl.nasa.gov/horizons.html

JimBim wrote:... or maybe they can be used only in newer versions than mine is (1.3.0) ?

That's right. The definitive 1.3.1 should be out RSN, and you'll be able to use Locations in that.

Grant

OK, I was gone for some time, so I had no chance to than you for your answers, but now I'm back, and ... THANKS:)