Do paddhatiyan prachalit hain: amanta (Amavasya se Amavasya, zyada South India mein) aur purnimanta (Purnima se Purnima, zyada North India mein). Dono mein tithiyan same hoti hain — sirf maheene ka naam kabhi-kabhi ek fortnight aage-peeche shift ho sakta hai. Is site ki saari ganana amanta paddhati par aadharit hai.