add toc and index text

jeffjennings · jeffjennings · commit ab1313bf8a57 · 2025-06-16T22:11:16.000-04:00
diff --git a/_toc.yml b/_toc.yml
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+format: jb-book
+root: index
+chapters:
+- file: 1_Coordinates-Intro
+- file: 2_Coordinates-Transforms
+- file: 3_Coordinates-Velocities
+- file: 4_Coordinates-Crossmatch
diff --git a/index.md b/index.md
@@ -0,0 +1,2 @@
+This is a set of tutorials on how to use the `astropy.coordinates` package to work with astronomical coordinates.
+We will introduce many of the key concepts underlying how to represent and transform astronomical coordinates using `astropy.coordinates`, including how to work with both position and velocity data within the coordinate objects. We will also explore how the `astropy.coordinates` package can be used to cross-match two catalogs that contain overlapping sources that may have been observed at different times.

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	`1`	+This is a set of tutorials on how to use the `astropy.coordinates` package to work with astronomical coordinates.
	`2`	+We will introduce many of the key concepts underlying how to represent and transform astronomical coordinates using `astropy.coordinates`, including how to work with both position and velocity data within the coordinate objects. We will also explore how the `astropy.coordinates` package can be used to cross-match two catalogs that contain overlapping sources that may have been observed at different times.