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%
10
flagFinland
9%
0%
90%
0%
31
flagthe United Arab Emirates
0%
9%
90%
0%
11
flagItaly
3%
0%
86%
10%
29
flagFrance
15%
0%
80%
5%
20
flagRepublic of Ireland
5%
5%
78%
10%
19
flagGermany
11%
2%
76%
7%
113
flagSpain
25%
0%
75%
0%
12
flagPoland
18%
3%
71%
6%
5265
flagUnknown
20%
4%
68%
8%
25
flagthe United States
19%
1%
64%
14%
103
flagthe Netherlands
16%
4%
64%
16%
25
flagNorway
15%
7%
61%
15%
13
flagthe United Kingdom
20%
4%
60%
13%
187
flagIndia
28%
14%
50%
7%
14
flagSweden
40%
10%
30%
20%
10

Gender

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

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Who introduced the Gregorian calendar?
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Author: Krzysztof Moskal
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