Gregorian calendar

Gregorian calendar, uu calendar hae jiske abhi dunia bhar me kaam me laawa jjae hae. Iske 1582 se kaam me laae ke suruu karaa gais rahaa kaaheki puraana Julian calendar me ek galti rahaa. Julian calendar me ek saal me 365.25 din rahaa, lekin dunia, suraj ke parikrama 365.2425 din me kare hae. Iske matlabb ae ki Julian calendar ke saal 11 minute se galat rahaa. Ii galti ke sudhare ke khatir leap saal ke niyam ke badal ke ii karaa gais, "Leap saal nai rahii jab saal 00 me khalaas hoe hae (jaise 1900), lekin rahii jab saal ke 400 se divide karaa jaae sake hae. (jaise ke 2000)