(from the article `mathematics`) ...importance in these universities were the Arabic-based versions of Euclid, of which there were at least four by the 12th century. Of the numerous ...
Found on http://www.britannica.com/eb/a-z/c/12
The rim of Campanus is roughly circular, with an outward bulge along the western rim and an inward bulge to the north-northwest. The outer wall has not been significantly eroded, although it has a low saddle-point along the south. The interior floor has been resurfaced by basaltic-lava, leaving only a small central peak projecting
Found on http://en.wikipedia.org/wiki/Campanus_(crater)
Thirteenth century astrologer and mathematician who devised the house system that bears his name, wh
Found on http://www.superglossary.com/Glossary/Science/Astrology/
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