Unit 2 Flashcards
Astrology
Belief that the star arrangement affects our everyday life.
Astronomy
The study of space
Constellations
Groups of stars developed by ancient Greeks
They don’t exist because stars are at different distances
Early practical uses of stars
- timelines were used depending on where the stars were in the sky
- caleneder depending on which stars appeared in the night sky
- directions like North Star
Geocentric theory
The earth was the centre of universe and everything revolves around us.
The stars were one single plane (same distance away)
Copernicus
Heliocentric theory.
Believed earth was not the centre but the sun was.
He had no proof to support his hypothesis.
Three key scientists who showed proof for heliocentric theory.
Kepler, Galileo, and Newton.
Kepler
Proved that objects in space must be at different distances.
Galileo
Improved the telescope and used it to first look at stars and planets
Newton
Proved that the sun has enough mass to hold objects in orbit.
Sun is the centre
Rotation
Turning of the earth on its own axis
Sidereal day
Rotation relative to stars in space is faster than 24 hours. ( 23 hrs 56 min)
Revolution
Movement of earth around the sun
Circumpolar constellations
- Constellations found more north and south
- appear to make circles in the night sky
Rising and setting constellations
Te constellations found along the suns path = zodiac constellations
-closer to equator
