"full-moon"

A blue moon is an additional full moon that appears in a subdivision of a year: the third of four full moons in a season.

This time it was bigger and brighter than the last full-moon because it was within 90 per cent of its 'perigee' in the orbit

Earlier, students of class-I spotted the two giant outer planets Saturn and Jupiter and captured them on their cameras on December 21, 2020.