International Ellipsoid of Reference

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Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

7 of the World’s Deadliest Shipwrecks

bat flying

Are Bats Really Blind?

Cheetah (Acinonyx jubatus) standing on rock, side view, Masai Mara National Reserve, Kenya

The Fastest Animals on Earth

Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro

Why Is Christmas in December?

Thanksgiving Turkey with all the sides

Why Do We Eat Turkey on Thanksgiving?

Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.

Why Is the Mona Lisa So Famous?

Chinese dragon sculpture or statue.

10 Legendary Creatures from Around the World

International Ellipsoid of Reference

cartography

Learn about this topic in these articles:

shape and size of Earth

In map: Development of reference spheroids
An International Ellipsoid of Reference was adopted by the Geodetic and Geophysical Union in 1924 for application throughout the world.
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