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- Anaximander (3421 bytes)
3: ...onomical instruments as the [[sundial]] and the [[gnomon]] to ancient [[Greece]].
6: ...arn that he believed the beginning or first principle (''[[arche]],'' a word first found in Anaximande...
8: He never defined this principle precisely, and it has generally (e.g. by [[Arist...
12: ...e had no theory of [[natural selection]], some people consider him to be [[evolution]]ary theory's mos...
14: ...hough it could not be perceived directly, could explain the opposites he could clearly see around him. - Sundial (16148 bytes)
18: Tilting the style or [[gnomon]] of a standard sundial is the only practical way...
20: ... Earth's axis of rotation. That is, the end of a gnomon should point at the north celestial pole in the n...
22: A sundial can be rotated around its style or gnomon (which must still point at the celestial pole) a ...
26: ...rved gnomons or other arrangements to directly display the clock time.
28: == Design & principles of operation == - Hipparchus (astronomer) (50785 bytes)
8: ...("Geography"), and from [[Pliny the Elder]]'s ''[[Pliny's Natural History|Naturalis historia]]'' ("Nat...
14: ... but it is not known if and when he visited these places.
22: ...o [[Aristarchus]] of [[Samos]]. Some put in this place also Ptolemy of Alexandria. Hipparchus writin...
34: ...that the Chaldeans routinely made. Preserved examples date from [[652 BC]] to [[130|AD 130]], but pro...
45: ...arly various relations between the periods of the planets were known. The relations that Ptolemy attr... - Hipparchus (50784 bytes)
7: ...("Geography"), and from [[Pliny the Elder]]'s ''[[Pliny's Natural History|Naturalis historia]]'' ("Nat...
13: ... but it is not known if and when he visited these places.
21: ...o [[Aristarchus]] of [[Samos]]. Some put in this place also Ptolemy of Alexandria. Hipparchus writin...
33: ...that the Chaldeans routinely made. Preserved examples date from [[652 BC]] to [[130|AD 130]], but pro...
44: ...arly various relations between the periods of the planets were known. The relations that Ptolemy attr... - History of science in early cultures (11033 bytes)
3: ...ment of]] [[agriculture]], which allowed for a surplus of food, it became possible for early [[Civiliz...
9: ...t Plimpton 232 records a number of Pythagorean triplets (3,4,5) (5,12,13). ..., dated 1900 BC, possibl...
11: ...ms of [[horoscope]]s and [[omen]]s, which might explain the popularity of the clay tablets. [[Hipparch...
16: ...y the Greeks. These instruments, as well as the [[gnomon]], facilitated development of early astronomy thr...
38: ...Revolution]]. The philosophies of [[Socrates]], [[Plato]], and [[Aristotle]] being preeminent during t... - Geography1 (26085 bytes)
2: ...and the world and all of its human and natural complexities-- not merely where objects are, but how th...
5: ...plants and animals, geography is highly interdisciplinary.
7: {{Cquote2|''mere names of places...are not geography... know by heart a whole ...
9: Geography as a discipline can be split broadly into two main sub fields: [[human geogr...
15: ...atmosphere]], [[pedosphere]], and global [[flora (plants)|flora]] and [[fauna (animals)|fauna]] patter...
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