Moon Phases

Each night in Terraria the moon moves across the sky from left to right (West to East). As each night passes, the moon moves into a different phase. Even if it is a Blood Moon, the cycle will not be disrupted, and continue as usual.

Including the Blood Moon, you could say there are actually 15 different phases of the moon, due to something such as a full moon becoming a full Blood Moon (a new moon cannot be a Blood Moon due to the moon not being in the sky). Without the Blood Moon there are only eight phases.