NEW STYLE CALENDAR
\njˈuː stˈa͡ɪl kˈaləndə], \njˈuː stˈaɪl kˈaləndə], \n_j_ˈuː s_t_ˈaɪ_l k_ˈa_l_ə_n_d_ə]\
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the solar calendar now in general use, introduced by Pope Gregory XIII in 1582 AD to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752
By Princeton University