Size and distance of the Earth, Moon and Sun
Channel: Astronomy with Mr Guerin
Date: 2019-07-11

How big and far away are the Earth, Moon and Sun?  And how do we know?  This video follows the ancient Greek astronomers, and tells you everything you need to know for this part of EdExcel's Astronomy GCSE.

Download the slideshow:
https://drive.google.com/drive/folders/1v7n69srfzFmgYxF9Vct6FKp3r_ZRqFjx

Image credits:

Astronomical coordinates, jim slater307, wikimedia, CC BY-SA 4.0
https://commons.wikimedia.org/wiki/File:Orientation_of_astronomical_coordinates_projected_on_the_Celestial_Sphere.jpg

Earth, Moon and Sun system, Siyavula Education, flickr, CC BY-SA 2.0
https://www.flickr.com/photos/121935927@N06/13598100735

Earth and Moon, Nickshanks, wikimedia, CC BY 2.5
https://en.wikipedia.org/wiki/File:Earth-Moon.png

Earth, Moon and Sun pictures, pngimg, CC BY-NC 4.0
http://pngimg.com/download/22772
http://pngimg.com/download/25412
http://pngimg.com/download/13425

Eratosthenes experiment, cmglee, David Monniaux, jimht at shaw dot ca, wikimedia, CC BY-SA 4.0
https://en.wikipedia.org/wiki/Eratosthenes#/media/File:Eratosthenes_measure_of_Earth_circumference.svg

Super Blood Moon Eclipse, NASA, wikimedia, CC BY 2.0
https://commons.wikimedia.org/wiki/File:Super_Blood_Moon_Lunar_Eclipse_(21743075506).jpg

Lunar eclipse, Luca, wikimedia, CC0 1.0
https://en.wikipedia.org/wiki/File:Lunar_eclipse.svg

Lunar eclipse contact diagram, Tomruen, wikimedia, CC BY-SA 4.0
https://commons.wikimedia.org/wiki/File:Lunar_eclipse_contact_diagram.png