Here's why:
* The far side of the moon always receives sunlight. The moon rotates once on its axis in the same amount of time it takes to orbit the Earth. This means the same side of the moon always faces us, and the opposite side, the "far side," always faces away.
* The terms "dark side" and "light side" are misleading. The far side of the moon experiences both day and night, just like the side we see. It's simply that we never see it in daylight from Earth.
So, while there's no specific term, you could simply say:
* The sunlight is shining on the far side of the moon.
* The far side of the moon is experiencing daytime.
