THITHI(Indian lunar calnader calculator)

When sun and moon combines in a close degree or same nakshtra then it is called as New moon day which is starting of thithi and we call it as "Amavasya". After that when moon moves to next nakhstra then it is called sukla pratipath(1st day of month), 2nd (sukla dwithiya), 3rd (sukla trithiya) ...like that up to 14days. After that full moon day comes that we call as Powrnami (Poonam). The name for this series of days (from new moon to full moon) starts with 'sukla'. So why do we use sukla name? Because during this time, moon is moving towards full moon day.

Now we r going to discuss the other series of days that is from the full moon day to new moon day. Like I have already discussed, same name comes but here is a small change that is the next day of full moon day is called as Krishna pratipath, 2nd day(krishna dwithiya). Just observe that I have used “Krishna” word which means black, why black? Because moon is going closer to sun which makes it dark during new moon day.