Here's all you need to know to help us measure the size of Earth's shadow during the total lunar eclipse on Jan. 20–21, 2019.
The post Useful Projects for a Lunar Eclipse appeared first on Sky & Telescope.
Here's all you need to know to help us measure the size of Earth's shadow during the total lunar eclipse on Jan. 20–21, 2019.
The post Useful Projects for a Lunar Eclipse appeared first on Sky & Telescope.