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
flagVietnam
0%
0%
100%
0%
11
flagthe United Arab Emirates
0%
5%
95%
0%
20
flagFinland
9%
0%
90%
0%
32
flagGreece
10%
0%
90%
0%
10
flagAustria
0%
0%
90%
0%
10
flagItaly
3%
0%
84%
9%
33
flagCanada
15%
0%
84%
0%
13
flagFrance
13%
4%
78%
4%
23
flagSpain
23%
0%
76%
0%
13
flagGermany
12%
2%
75%
8%
123
flagRepublic of Ireland
7%
3%
74%
14%
27
flagPoland
18%
3%
72%
5%
6032
flagthe United States
16%
1%
70%
11%
136
flagthe Netherlands
12%
3%
70%
12%
31
flagNorway
14%
7%
64%
14%
14
flagthe United Kingdom
19%
4%
62%
12%
229
flagUnknown
23%
2%
62%
11%
43
flagIndia
29%
17%
47%
5%
17
flagSweden
36%
9%
36%
18%
11

Gender

men76%
women75%
Pope Gregory I, called the Great
16%
17%
St. Gregory the Illuminator
2%
1%
Pope Gregory XIII
76%
75%
Galileo
5%
4%

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Who introduced the Gregorian calendar?
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Author: Krzysztof Moskal
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