The size of the Moon - Deepstash

Bite‑sized knowledge

to upgrade

your career

Ideas from books, articles & podcasts.

The size of the Moon

In one of Aristarchus' books that did survive, he laid out the earliest known attempted calculations of the sizes and distances to the Sun and Moon.

From solar eclipses, where the Moon passes in front of the Sun, they realised that the Sun was further away. Aristarchus estimated that the size of the Moon was approximately one-third that of the Earth, based on the careful timing of lunar eclipses. He was surprisingly accurate in determining the ratio of the size of the Earth to the Moon. (the Moon has a diameter 0.27 times that of Earth).

1

STASHED IN:

48

MORE IDEAS FROM THE SAME ARTICLE

The Antikythera Mechanism is the word's oldest surviving mechanical calculator. The device was discovered in an ancient shipwreck in 1900 and dates between the 3rd and 1st centuries BC.

When manually rotated by a handle, the gears span dials on the exterior showing the Moon's phase...

The earliest known heliocentric theory of the solar system came from Aristarchus of Samos (310BC to 230BC). He argued that the Sun was central. He also placed all the then known planets is their correct order of distance around the Sun. His original text was unfortunately lost to...

In the Histories by Herodotus (484BC to 425BC), Herodotus recounts the story of Phoenician sailors who were dispatched by King Neco II ofEgypt (about 600BC), to sail clockwise around continental Africa, starting in the Red Sea.

The voyage took years. As they rounded the southern tip of...

  • Eratosthenes (276BC to 195BC) relied on measuring the different lengths of shadows cast by poles stuck vertically into the ground, at midday on the summer solstice, at different latitudes. The difference in the shadows demonstrated how much the Earth's surface curved. Erato...

Discover and save more ideas by creating a

FREE

Deepstash account.

Develop a

reading habit

, save

time

and create an amazing

knowledge library

.

GET THE APP:

MORE LIKE THIS

Who has calculated the circumference of the Earth?

The first person to determine the size of Earth was Eratosthenes of Cyrene, who produced a surprisingly good measurement using a simple scheme that combined geometrical calculations with physical observations and without leaving Egypt. 

4

STASHED IN:

15

The Science Of Rocket Science

Newton’s Third Law Of Motion, which states that every action has an equal and opposite reaction is the heart of rocket science.

The basics of rocket science are not that complicated, only involving getting the moving force that overcomes the pull of gravity, in a calculated and co...

29

STASHED IN:

83

Craters On The Moon

  • The 17th century saw Galilieo exploring the moon using his telescope, wondering how craters were formed.
  • Two centuries later, astronomers like Franz von Gruithuisen proposed that asteroids were responsible for the same, a theory that was rejected.
  • The perfect circular ...

STASHED IN:

6