 
 <prompt> ```Make use of di article answer di questions.

To specify di date clearly, dual dating or Old Style (O.S.) and New Style (N.S.) dey sometimes used with dates. Dual dating dey use two consecutive years because of differences for di starting date of di year, or e fit include both di Julian and Gregorian dates. Old Style and New Style (N.S.) dey show whether di start of di Julian year don change to start on 1 January (N.S.) even though documents wey dem write for dat time use different start of year (O.S.), or whether a date dey follow di Julian calendar (O.S.) instead of di Gregorian (N.S.).

Di Gregorian calendar na reform of di Julian calendar wey Pope Gregory XIII institute for 1582, after whom di calendar dey named, by papal bull Inter gravissimas wey dem date 24 February 1582. Di reason why dem adjust am na to bring di date for di celebration of Easter to di time of year wey dem dey celebrate am when dem introduce am for di early Church. Even though di First Council of Nicaea for 325 recommend say all Christians suppose celebrate Easter on di same day, e take almost five centuries before virtually all Christians achieve dat objective by adopting di rules of di Church of Alexandria (see Easter for di issues wey come up).

1. Wetin be anoda name for dual dating?
2. Wetin dual dating dey for?
3. How many years e dey for?
4. Wetin be di name wey dey include?
5. For which year e change?
6. Why e need to change?

Numbered answers:``` <response>: ```1. Old Style (O.S.) and New Style (N.S.)
2. differences for di year wey e dey start
3. two years wey dey follow each other
4. Pope Gregory XIII,
5. for di year 1582
6. to change di date wey dem dey celebrate Easter to di time of di year wey di early Church dey celebrate am``` 