Wikipedia
Blazhko is a lunar impact crater that is located in the northern hemisphere on the far side of the Moon. It lies to the northwest of the crater Joule, and to the south of Gadomski.
The rim of this crater is generally circular, but with some irregularities. There is a small outward bulge in the rim to the east-southeast, and an inward bulge on the opposite face. There is also a slight outward bulge along the north rim. The satellite crater Blazhko F is attached to the exterior of the east rim. The inner wall along the northeast face is striated with terraces. The interior floor is relatively level.
The satellite crater Blazhko T, located due south of Blazhko, has a higher albedo than its surroundings, and possesses a ray system. The most prominent of these rays extends southward, crossing the floor of the crater Harvey.