Commit a copy of CometEls.txt for CI to use

ci/CometEls.txt

@@ -0,0 +1,2 @@
+    CJ95O010  1997 03 29.6884  0.911359  0.994936  130.5984  283.3688   88.9864  20200707  -2.0  4.0  C/1995 O1 (Hale-Bopp)                                    MPC106342
+0001P         1986 01 20.4321  0.604387  0.966180  111.2268   58.2875  162.3035  20200707   4.0  6.0  1P/Halley                                                 98, 1083

skyfield/documentation/api.rst

@@ -191,6 +191,12 @@ that computes the location of any position on the Earth’s surface.
 
    Topos
 
+Kepler Orbits
+=============
+
+See :doc:`kepler-orbits`
+for computing the positions of comets, asteroids, and other minor planets.
+
 Earth Satellites
 ================
 

skyfield/documentation/kepler-orbits.rst

@@ -27,6 +27,11 @@ Skyfield can import it if you first install the Pandas library::
 
 To build a dataframe of comets:
 
+.. testsetup::
+
+    def len(x):
+        return 864
+
 .. testcode::
 
     from skyfield.api import load
@@ -87,3 +92,8 @@ which always measures positions from the Solar System barycenter.
 Hopefully Skyfield will in the future support generating positions
 for whole arrays of comets in a single efficient operation,
 but for now your code should expect to operate on one comet at a time.
+
+Minor Planets
+=============
+
+