noun
counterglow; Gegenschein
Astronomical term for a faint brightening of the night sky at the antisolar point, caused by backscattered sunlight from interplanetary dust.
対日照は、太陽と正反対の方向に見える淡い光です。
The counterglow is a faint light visible in the direction exactly opposite the sun.
秋
It is difficult to observe the Gegenschein in the autumn night sky.