Of Astronomical Discoveries.

A Historical Timeline

Of Astronomical Discoveries.

A Historical Timeline

100 AD

**600**

**1543**

1580

1609

Greek Astronomer Ptolemy proposes the first geocentric theory of the universe.

The myans create the first accurate calendar using the stars.

Copernicus publishes his heliocentric theory of the universe, the first of its kind.

Tycho Brahe completes his planetary motion data, the most accurate in the world at the time.

Galileo finishes his improved version of the telescope, and will later use it to discover the 4 Galilean moons of Jupiter.

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1609-1631

**1687**

1905-1915

2019

Johannes Kepler publishes his three laws of planetary motion:

1. All planets move in elliptical orbits, with the sun as one of the foci.

2. A radius joining any planet to the sun sweeps out equal area of equal time.

3. T^2=R^3, where T is the period of one revolution, and R is the average distance between the planet and the sun.

Newton discovers his law of universal gravitation: Gravity causes to fall on earth and planets to orbit around the sun.

Einstein publishes his theory of special relativity: The idea that the speed of light remains constant to any observer, and his famous E=mc^2 equation.

In 1915, Einstein publishes his theory of general relativity. Essentially, he discovers that gravity warps space time and light.

The first photograph of a black hole is taken, helping prove Einsten's theory of relativity.

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RESOURCES

https://www.dummies.com/education/science/astronomy/an-astronomical-timeline/

CREATED BY

Karsten Kotchenruther