It is the moon phase when the earth blocks the light of the sun from reaching the surface of the moon (from the perspective of those on the earth).
चन्द्रमा पृथ्वीको धेरै नजिक आउनेछ त्यसैकारण चन्द्रमा सामान्यभन्दा निकै ठूलो देखिनेछ ।