Add sample SSC file for each GNSS system

README.md

@@ -36,7 +36,7 @@ Upstream Celestia:
 
 * https://github.com/CelestiaProject/Celestia
 
-## TLE
+## TLE Conversion
 
 TLE Conversion Spreadsheet:
 
@@ -59,6 +59,29 @@ Info on `.ssc` files:
 * https://en.wikibooks.org/wiki/Celestia/SSC_File
 
 
+In Celestia name "Galileo" is used for the *other* spacecraft, not
+for the EU GNSS. So the name used in development here adds `-gnss`,
+ala, `galileo-gnss.ssc`, whereas the other GNSS don't.
+
+
+## TLE Sources
+
+Beidou (China)
+* https://celestrak.com/NORAD/elements/beidou.txt
+
+Galileo (Europe)
+* https://celestrak.com/NORAD/elements/galileo.txt
+
+Glonass (Russia)
+* https://celestrak.com/NORAD/elements/glo-ops.txt
+
+GNSS (All)
+* https://celestrak.com/NORAD/elements/gnss.txt
+
+GPS (USA)
+* https://celestrak.com/NORAD/elements/gps-ops.txt
+
+
 ## Spice
 Spice TLE:
 "Evaluate NORAD two-line element data for earth orbiting spacecraft."

data/beidou/beidou.ssc

@@ -0,0 +1,20 @@
+"2010-001A" "Sol/Earth" {
+  Class "spacecraft"
+  # Mesh  
+  Radius  0.005
+
+  EllipticalOrbit {
+    Epoch  2459720.33613831
+    Period  0.99731528
+    SemiMajorAxis  42165.413
+    Eccentricity  0.0004661
+    Inclination  1.8382
+    AscendingNode  46.5258
+    ArgOfPericenter  17.4955
+   MeanAnomaly  255.8633
+  }
+  Obliquity  1.8382
+  EquatorAscendingNode  46.5258
+  RotationOffset  353.0270
+  # Orientation  [  ]
+}

data/glonass/glonass.ssc

@@ -0,0 +1,20 @@
+"2007-052A" "Sol/Earth" {
+  Class "spacecraft"
+  # Mesh  
+  Radius  0.005
+
+  EllipticalOrbit {
+    Epoch  2459719.68815104
+    Period  0.46925415
+    SemiMajorAxis  25507.827
+    Eccentricity  0.0000891
+    Inclination  66.0824
+    AscendingNode  5.6073
+    ArgOfPericenter  294.3159
+   MeanAnomaly  242.2533
+  }
+  Obliquity  66.0824
+  EquatorAscendingNode  5.6073
+  RotationOffset  183.6393
+  # Orientation  [  ]
+}

data/gnss/gnss.ssc

@@ -0,0 +1,20 @@
+"1997-035A" "Sol/Earth" {
+  Class "spacecraft"
+  # Mesh  
+  Radius  0.005
+
+  EllipticalOrbit {
+    Epoch  2459718.94467728
+    Period  0.49859567
+    SemiMajorAxis  26560.345
+    Eccentricity  0.0057297
+    Inclination  55.5062
+    AscendingNode  156.8049
+    ArgOfPericenter  51.2220
+   MeanAnomaly  309.3262
+  }
+  Obliquity  55.5062
+  EquatorAscendingNode  156.8049
+  RotationOffset  80.2289
+  # Orientation  [  ]
+}

data/gps/gps.ssc

@@ -0,0 +1,20 @@
+"1997-035A" "Sol/Earth" {
+  Class "spacecraft"
+  # Mesh  
+  Radius  0.005
+
+  EllipticalOrbit {
+    Epoch  2459718.94467728
+    Period  0.49859567
+    SemiMajorAxis  26560.345
+    Eccentricity  0.0057297
+    Inclination  55.5062
+    AscendingNode  156.8049
+    ArgOfPericenter  51.2220
+   MeanAnomaly  309.3262
+  }
+  Obliquity  55.5062
+  EquatorAscendingNode  156.8049
+  RotationOffset  80.2289
+  # Orientation  [  ]
+}