Early theories about the Moon

Hipparchus

In 140 BCE, he finds out how to predict eclipses.

Jing Fang

______ rises the radiating influence theory, stating that the moon's light is just the sun's reflection in space.

radiating influence theory

the moon's light is just the sun's reflection in space.

Ptolemy

In 150 CE, he creates tables for calculating celestial body positions.

*Dream Pool Essays*

Essayswritten by Shen Kuo that explains celestian bodies are round rather than flat.

Shen Kuo

He wrote the “*Dream Pool Essays*“

Johannes Kepler

In 1609, he describes ellipses to explain how the planets move as free-floating bodies.

Zhang Heng

He’s the Chief Astrologer at the court of Chinese emperor An-ti; and was a mathematician and observer.

2,500

Heng recorded _____ stars that were "brightly shining.”

11,520

Heng estimated that there were an additional _____ stars that were "very small."

The Spiritual Constitution of the Universe

Ling Xian English translation

Ling Xian

In Heng’s treatise, he positioned Earth at the center of the universe, saying that "Earth is the yolk of the egg, lying alone at the center, and the sky is like a hen's egg, and is as round as a crossbow pellet."

lunar eclipse

the sun's light is blocked from reaching the moon due to Earth's presence

Shen Kuo

a Chinese astronomer, expanded on Zhang's work in the 11th century.

waxing and waning

Shen showed how the moon's ______ proved that the sun and moon were spheres.

1609

Johannes Kepler describes ellipses to explain how the planets move as free-floating bodies.

11th century

Shen Kuo’s *Dream Pool Essays* explains that celestial bodies are round rather than flat.

150 CE

Ptolemy creates tables for calculating celestial body positions.

1st century BCE

Jing Fang rises the radiating influence theory, stating that the moon's light is just the sun's reflection in space.

140 BCE

Hipparchus finds out how to predict eclipses.