In a lunar eclipse, the Earth's shadow — called the umbra — blocks the sun's light from hitting the full moon, resulting in a dimmer moon with a distinct red and orange cast. It's also called a blood moon.

Its primary objective following the March 2 touchdown inside Mare Crisium crater was to deliver 10 NASA instruments designed to gather lunar subsurface data. But the eastern edge of the moon’s near east side also provided a perfect spot for viewing a solar eclipse from the moon’s point of view.

Firefly's Blue Ghost witnessed Earth blocking out the Sun from its point of view on the Moon, while we experienced a lunar eclipse on Earth.