If you like the website and want to contribute to the running costs then please do so below. All contributions are most welcome.

PayPal - The safer, easier way to pay online.

Due to the eccentricity of the lunar orbit the Moon displays a small apparent "wobble" as seen from Earth, which results in a small movement of the Moon's surface about its average position. Although one side of the Moon always faces the Earth, this "libration" allows us to see up to 59% of the Moon's disc instead of 50%.

Lunar libration (credit:- Tomruen)

Glossary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z