Lunar eclipse
Date: 06 August 2020
Satellite: Hubble Space Telescope
Copyright: ESA/Hubble, M. Kornmesser, CC BY 4.0
This diagram explains the geometry of the lunar eclipse.
When the moon is entirely in the Earth's umbra (known as a total lunar eclipse or umbral eclipse), all sunlight reaching the lunar surface has been refracted or scattered through Earth's atmosphere. When the moon is in the Earth's penumbra (known as a penumbral eclipse), illumination comes from both direct sunlight and sunlight refracted and scattered through the planet's atmosphere. This is similar to an exoplanet transit observation.
This work is licensed under a Creative Commons Attribution 4.0 International License. 
Last Update: 1 September 2020
