HOA: Timeline

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HOA: Timeline

46 BC

By: Melissa Griffo

Julius Caeser instigated the calender reformation, and made a calender witha 365 1/4 day length; originally proposed by Callippus who was a Greek astronomer himself

1400 BC

Stonehenge was constructed in England. It is believed to be placed in such way to track regular movement of the moon, and lunar eclipses.

In what is now France, the stones of Carnac were constructed. Like Stonehenge, all the rocks were upright in a pattern; most think that these stone alligned with the sun, and the moon in a specific way.

Claudius Ptolemaeus publishes Almagest, in which he catalogued 1,022 stars

24o BC

This is when Halley's comet was first seen, and recorded by Chinese astronomers

2000 BC

4500 BC

3000 BC

The first solar-lunar calendars were made in Egypt. It is known as the Solunar . It consists of 12 lunar months, and is not related to the seasons what so ever. It comes back to its original dates every 33 Islamic years.

1450 BC

3500 BC

The Pentre Ifan Dolmen Tomb was made in Wales.Its a burial place was stones stacked on one another said to allign with specific stars, the sun, or even the moon.

This is when the Egyptains started using sundials.

The oldest Egyptain water clock was created at this time.A year with 365 days, 12 months of 30 days, and 5 extra days for the birthdays of gods.

600 BC

The birth of Greek astronomy. This is when Thales theory of the Earth floating in a large body of water was made.

523 BC

Eratosthenes calculated the size of the Earth.

The first recordings of zodiac signs. These were created by the Babylonians.

127 AD

Edmund Halley discovers that stars move through space. He found that the positions of stars change with time. He published these findings.

120 BC

194 BC

Hipparchus defines the by latitude and ; also he makes a triangular measurement of the celestial navigation.

140 AD

In Greece, Ptolemy suggests geocentric theory of the universe in the famous work "Mathematike Syntaxis."

813 AD

In Iraq, Al Mamon founds the Baghdad school of astronomy for others to learn about astronomy as well.

1054 AD

Astronomers from China observe, and record the first super nova in Taurus. It is known as the Crab Nebula.

1718 AD

1200 AD

Establishments of the first universities to offer majors in astronomy. These were in Europe, Paris,etc.

1330 AD

Jean Buridan develops the theory of motion. It was remarkable because of the way it contradicted Aristotles established ideas.

1456 AD

Regiomontanus uses the recent invention of printing to produce astronomy books and tables. He also produced almanacs, and other things.

1600 AD

This is when Galileo began his experiments with motion such as falling and rolling,his conclusions similar to Newtons 3 laws of motion.

1682 AD

1686 AD

Edmund Halley predicts return of Comet Halley. His calulcations led to the answer of between the years of 1758-1759. He was right.

Newton publishes the book "Principia". This states Newton's monumental work, and described his discoveries about gravity, motion and the orbits of the planets.

Christian Huygens proposes that light consists of waves. Huygens's ideas contradicted Newton's who proposed that light was mae up of a stream of particles.

1678 AD

The History of Astronomy: Greatest Moments

A video summing up history of Astronomy throughout the years in less than 5 minutes!

1) "Astronomical Timeline." Astronomical Timeline. N.p., n.d. Web. 21 Feb. 2014.2) "Astronomy Timeline." Astronomy throughout History. N.p., n.d. Web. 21 Feb. 2014.3) "Astronomy and Space Timeline." About.com Space / Astronomy. About.com, n.d. Web. 20 Feb. 2014.

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