Question

Does Earth eclipse the Sun at the L2 Lagrange point?

Answer 1

Like an eclipse, a transit occurs when one object appears to pass in front of another object. But in a transit, the apparent size of the first object is not large enough to cast the second into complete shadow. Instead a much smaller dark shadow makes its way across the face of the further planet or star.

Answer 2

Thirdly, Earth's umbra does not quite reach the Lagrange Point L2 of theSun-Earth system, so solar radiation is not entirely blocked. Finally, JWST willhave a Lissajous orbit around L2 to avoid partial eclipses of the Sun and the attendant temperature fluctuations and communications interference.