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

2. 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.

9. Observations leading to the belief that the Earth is round.
1. Observing lunar eclipses (i.e. when the earth blocks the sun from the
moon, casting its round shadow on the moon's surface
2. “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)”