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In 2018 Ad there was a red lunar eclipse also known as a red Moon.

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In order to account for a noticeable decrease in the obliquity of the ecliptic over time, the Arabic astronomer Thabit ibn Qurra proposes the theory of trepidation. The theory basically states that as time passes the ecliptic actually wobbles back and forth during its annual motions. It is accepted until refuted by astronomer Tycho Brahe.

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Jun 1, 2010 ... During my Presidency of the Royal Astronomical Society I've had to deal ... to second century AD) based theoretical astronomy upon observations made ..... It has been known that there are star clusters 500 million years old in ...

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The Polish astronomer Nicolaus Copernicus advocated the heliocentric view, calculated distances to planets and period of planets

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A famous astronomer named Cleomedes also had written a book about astronomy.

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Mesa VerdeCliff Dwellings(c. 1000-1300)Pete MaioCathedral and Tower at PisaTasha Vincentc. 1000-1300Classic Pueblo period of Anasazi culture; cliff dwellings.c. 1000Hungary and Scandinavia converted to Christianity. Viking raider Leif Eriksson discovers North America, calls it Vinland. Beowulf, Old English epic.c. 1008Murasaki Shikibu finishes The Tale of Genji, the world's first novel.1009Muslims destroy Holy Sepulchre in Jerusalem.

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A Greek astronomer named Geminus created a textbook about astronomy. the book is named the introduction of the Phenomena.

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Lots of things happened, but no one single thing of great importance.

The "tradition" was that Jesus was born in 1AD, AD being an abbreviation for Anno Domini, which is Latin for "Year of our Lord".

However, modern theologians and historians are pretty convinced that Jesus was actually born six or seven years earlier, so the numbering is off.

People who don't like the religious association tend to use the term "CE" for Common Era instead of AD, and BCE for Before Common Era instead of the traditional BC (Before Christ).

Sidebar: One curiosity is that 1AD follows directly after 1BC. There is no Zero year in between them. So ten years before 5AD would be 6BC. This is because the concept of zero as a number was not invented until the Islamic era, along with a lot of other mathematical and scientific advances that came out of Islamic innovation. This lack of zero is also why Easter Sunday is referred to as the Third Day after Good Friday.

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What happened in the starting year of 1 AD?

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Answer: Lots of things happened, but no one single thing of great importance. The "tradition" was that Jesus was born in 1AD, AD being an abbreviation for Anno Domini, which is Latin for "Year of our Lord". However, modern theologians and historians are pretty convinced that Jesus was actually ...

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Aristarchus The first planetary theory took place then is adopted by the Greeks. Julius Caesar is elected Emperor an takes absolute power during his reign.

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Hammurapi. A Dark Age in Greece. Homer's Illaid and Odyssey. MULAPIN. Hesiod's Works and Days. The First Spherical Model. Anaxagoras. Aristotle and On the He...

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A famous astronomer named Aristarchus found out the distance between the Earth, Sun and the Moon. Aristarchus also
presented the first known model that placed the Sun at the center of the universe.

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Hammurapi. A Dark Age in Greece. Homer's Illaid and Odyssey. MULAPIN. Hesiod's Works and Days. The First Spherical Model. Anaxagoras. Aristotle and On the He...

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The work introduces geometrical methods to geography and uses gnomonics to generate one of the earliest measurements of Earth's size. The Babylonian astronomers discovered the Moons

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Hammurapi. A Dark Age in Greece. Homer's Illaid and Odyssey. MULAPIN. Hesiod's Works and Days. The First Spherical Model. Anaxagoras. Aristotle and On the He...

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The astronomer Meton of Athens proposes a nineteen year cycle of the sun and moon.

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Hammurapi. A Dark Age in Greece. Homer's Illaid and Odyssey. MULAPIN. Hesiod's Works and Days. The First Spherical Model. Anaxagoras. Aristotle and On the He...

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Sulpicius Gallus made the first spherical shape there is no way of knowing if this was a proper sphere, because the model had no axis

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Hammurapi. A Dark Age in Greece. Homer's Illaid and Odyssey. MULAPIN. Hesiod's Works and Days. The First Spherical Model. Anaxagoras. Aristotle and On the He...