ANCIENT-GREEK-PHYSICS-AND-ASTRONOMY (2).pptx

ANCIENT-GREEK-PHYSICS-AND-ASTRONOMY (2).pptx

1. ASTRONOMY- natural science that studies celestial objects and phenomena. Explains their origin and evolution. ASTROLOGY- method of predicting events based upon the assumption that the celestial bodies—planets and stars indicate changes in the sublunar world. - A zodiac sign is a symbol that represents somebody’s personality, emotions and motivations. COSMOLOGY- branch of physics and metaphysics dealing with the nature of the universe.

2. Observations leading to the belief that the Earth is round. Observing lunar eclipses (i.e. when the earth blocks the sun from the moon, casting its round shadow on the moon's surface “Simultaneously measuring the length of the shadows cast by identical poles perpendicular to a flat surface that is tangential to the earth's radius at various, distant locations. If indeed the earth is round, then the shadows should all vary in length from one distant location to another. This means that the angle at which the parallel rays of sunlight struck each pole varied from one location to another. (Recall the alternate-angles theorem from Geometry class) If the earth is flat, then the lengths of all the shadows should be identical when measured simultaneously, since all rays of sunlight that strike the earth are parallel. However, they are not identical, but in fact, vary in such a way that the angles indicate a spherical surface. (This was one of the earliest methods to determine the radius of the earth)”