...Prucha

Written for the skylight dedication ceremonies July $17^{\mbox{\scriptsize th}}$, 1998.

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...sufficiency

Actually everyone wanted something from Huygens, but his line drawings were pretty feeble.

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...alphabetized

At least Claerbout really belongs before Chevron in SEP's opinion!

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...Sine

minus the cosine of the angle

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...Semi-Chord

half a chord

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...Sine

half the versed sine

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...apsides

apsis (pl. apsides)-- point of closest or furthest approach of an orbit around a body.

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...Nones

Nones, Ides, Kalends--Roman calendar designations (Beware the Ides of March!).

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