Lunar Transit from STEREO . ... Credit Copyright: STEREO Project , NASA Explanation: A million miles from planet Earth, last weekend the STEREO B spacecraft found itself in the shadow of the Moon. So , looking toward the Sun, extreme ultraviolet cameras onboard STEREO B were able to record a stunning movie of a lunar transit (aka solar eclipse ), as the Moon tracked across the solar disk. ... Tonight, the Moon will find itself in planet Earth's shadow in a total lunar eclipse . ...