The link on this web site took me to an abstract of this paper, below which was a link to a PDF. However this link took me to a page about the Montgomery College planetarium. Any help?
So I can. Wonderful! I wonder why a Google search didn’t find it.
Oh I don’t think that is the “Covariant Approach” that @PatrickPowers is after… As the planetarium link looks like its bust I’ve hosted a copy of the paper here: Covaraint Approach if anyone is interested 
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