Stjerneborg "castle of the stars" - the observatory
Tycho Brahe's instruments
Mural or wall - detection instrument that determines the elevation of stars and planets
Armillary instruments - measure the correct elevation and declination or latitudes and longitudes with respect to the ecliptic
Measure celestial bodies' angular distances
Tychonic System/Tychonian System
Tycho Brahe's model depicting the moon and sun rotating around the Earth, with the planets rotating around the Sun, all surrounded by a sphere of stars
Kepler
Studied planetary ordering (Copernicus)
Investigated the orbit of Mars
Founder of Modern Science
Kepler's Laws of Planetary Motion
1. The orbits of the planets are ellipses
2. The Law of Equal Areas
3. The Law of Harmony
Law of Equal Areas
The line joining the planet and the Sun sweeps out equal areas in equal time in all portions of its orbit
Law of Harmony
The square of the time it takes for the planet to make one revolution around the Sun (orbital period) is proportional to the cube of the semi-major axis of the planet's elliptical orbit
Kepler's Laws of Planetary Motion supported the Copernican theory
