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The planetarium is a great place to learn
the constellations, but those little
points of light on the ceiling are too close
to you to do CelNav with your sextant.

Try this out at home.  Take the height of your wall.
Now back up a couple of feet and do it again.
The wall fills a smaller angle in your sextant.
You'll have the same problem in a planetarium,
unless you have a way to mount the sextant firmly
in a "proper" location, at the correct angle.

Even the moon is far enough away from you that
moving a couple of feet is not going to cause
a big change in its height, as measured with
your sextant.  Not so in a planetarium.

Renee

   

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