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%
4%
95%
0%
23
flagFinland
6%
0%
93%
0%
43
flagAustria
0%
0%
90%
0%
10
flagCanada
13%
0%
86%
0%
15
flagItaly
4%
0%
83%
9%
43
flagGreece
8%
0%
83%
8%
12
flagBelgium
10%
10%
80%
0%
10
flagSpain
21%
0%
78%
0%
14
flagGermany
13%
2%
75%
7%
142
flagFrance
12%
4%
75%
8%
24
flagthe Netherlands
13%
2%
74%
9%
43
flagPoland
18%
3%
71%
6%
7793
flagthe United States
17%
1%
70%
11%
147
flagRepublic of Ireland
11%
2%
67%
17%
34
flagthe United Kingdom
16%
5%
65%
11%
293
flagUnknown
21%
4%
64%
9%
413
flagNorway
12%
6%
62%
18%
16
flagIndia
27%
16%
44%
11%
18
flagSweden
33%
16%
33%
16%
12

Gender

men74%
women75%
Pope Gregory I, called the Great
16%
17%
St. Gregory the Illuminator
2%
2%
Pope Gregory XIII
74%
75%
Galileo
6%
4%

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Who introduced the Gregorian calendar?
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Author: Krzysztof Moskal
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