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While "vertex" is used in optics, I think it's more applicable here in the astronomy sense - though I'm not sure the Japanese word in question works for that as well...? Kerochan no Miko 05:04, 24 February 2007 (MST)

The Japanese word is also used in astronomy/astronomical instruments. I'll adjust the trivia accordingly. --210 21:07, 24 February 2007 (MST)
Um, that's not what I meant. I meant that "vertex" also means, in an astronomical sense, "a point in the celestial sphere toward which or from which the common motion of a group of stars is directed" and "the highest point reached in the apparent motion of a celestial body" and I think it's more likely to mean one of those than an obscure technical term for lens manufacture. Kerochan no Miko 05:26, 25 February 2007 (MST)
While not ruling out the meanings you suggested, this Japanese word, as I know it, is used in astronomy for triangulation & optics (there're also some non-astronomy usage), & I only got the word "vertex" from a Japanese dictionary of optics, so I don't know if the Japanese word also has the same meanings as the word "vertex" in other areas. --210 06:26, 25 February 2007 (MST)
Reworded so it's a little less confusing, then. Kerochan no Miko 06:39, 25 February 2007 (MST)