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- Astrolabe (4446 bytes)
4: The '''astrolabe''' is a historical astronomical instrument and analog computer. Its many us...
6: ... invention of the astrolabe to [[Hipparchus (astronomer)|Hipparchus]] ([[2nd century BC]]) while other...
8: ...hollow disk, called the ''mater'', which is deep enough to hold one or more flat plates called ''tympa...
12: ...graduation of 360 degrees around the back edge. Another ruler, called the ''alidade'', is attached to...
16: ...entury]] (early Christian recipients of Arab astronomy included [[Gerbert of Aurillac]] and [[Hermannu... - First Crusade (34670 bytes)
2: ...and]] from [[Islam|Muslims]]. What started as a minor call for aid quickly turned into a wholesale [[m...
5: ...s]], gave rise to an entire class of warriors who now had very little to do but fight among themselves...
7: ...ng for control of [[Sicily]], while [[Pisa]], [[Genoa]] and [[Aragon]] were all actively fighting Isla...
9: ...hree years previously. This call, while largely ignored, combined with the large numbers of [[pilgrima...
12: ...n coast of [[Anatolia]], and faced enemies in the Normans in the west and the Seljuks in the east. Fur...
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