Clavius is one of the largest craters or walled plains on the Moon. It is a Nectarian aged crater that is sculptured by ejecta of younger craters and impact basins. Numerous craters therefore batter its floor and walls. For instance on the south part of its floor a chain of craters points to the Orientale impact basin. This series of pictures shows Clavius from sunrise to just over local noon. Thereby the crater changes from easily recognisable because of its size and mighty shadows to hard to find due to the brilliant ejecta blanket of Tycho. Its crater floor is full of detail. One thing to observe are ridges between Porter and Rutherfurd. These are very well seen under low sun heights. If the sun rises above Clavius, the ridges become more difficult to observe and the terrain becomes somewhat brighter than its surroundings.

Towards local noon, it can be seen that one of the bright rays of Tycho crosses this part of Clavius. The ridges are perhaps part of or sculptured by Tycho's ejecta blanket. Or is it part of Rutherfurds ejecta blanket? Similar but less distinct ridges are also seen north of Clavius C. One of Tycho's rays also crosses this part of Clavius. Of note is also the very hummocky apperance of the north-west side of the crater floor.