The celebration of someone’s 1000th full moon during his or her life is called Sahasra Chandra Darshan. It is a very special occasion for their life.
The ritual consists of empowering the person until the end of his life, reducing his ego, giving strength in the womb and being strong at birth.
Method to calculate the exact Sahasra Chandra Darshan
The synodic month is an average of 29.53 days and therefore 1000 Moon is 29530 days = 80.849 years = about 80 years and 10 months in the western calendar.
The occasion is traditionally celebrated on 3 full moons before a person’s 81st birthday.