Who introduced the Gregorian calendar?

Pope Gregory I, called the Great
St. Gregory the Illuminator
Pope Gregory XIII
Galileo
Gregory XIII was pope during the period from 13 May 1572 until 10 April 1585. The Gre­go­ri­an cal­en­dar, also called the Western Cal­en­dar, was in­tro­duced by him in 1582 with the Bull Inter Gravis­si­mas. The gre­go­ri­an calendar ba­si­cal­ly a re­fine­ment of the Julian cal­en­dar. The Gre­go­ri­an reform modified the Julian cal­en­dar's scheme of leap years, changing the mean length of the calendar year from 365.25 days to 365.2425 days.

Answers distribution

Pope Gregory I, called the Great
St. Gregory the Illuminator
Pope Gregory XIII
Galileo
answers
flagFinland
13%
0%
86%
0%
23
flagItaly
4%
0%
80%
14%
21
flagRepublic of Ireland
7%
0%
78%
14%
14
flagSpain
27%
0%
72%
0%
11
flagPoland
19%
3%
70%
5%
4157
flagGermany
13%
4%
67%
12%
65
flagthe United Kingdom
17%
5%
61%
15%
126
flagNorway
15%
7%
61%
15%
13
flagthe United States
24%
1%
60%
13%
65
flagIndia
23%
15%
53%
7%
13
flagthe Netherlands
21%
7%
50%
21%
14

Gender

men74%
women74%
Pope Gregory I, called the Great
17%
18%
St. Gregory the Illuminator
2%
2%
Pope Gregory XIII
74%
74%
Galileo
5%
4%

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Who introduced the Gregorian calendar?
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Author: Krzysztof Moskal
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