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
flagthe United Arab Emirates
0%
2%
97%
0%
34
flagSwitzerland
3%
0%
96%
0%
33
flagFinland
6%
0%
93%
0%
43
flagGreece
9%
0%
86%
4%
22
flagthe Netherlands
10%
1%
81%
7%
69
flagItaly
5%
1%
80%
9%
51
flagCanada
14%
0%
80%
4%
21
flagSpain
21%
0%
78%
0%
19
flagFrance
12%
4%
76%
8%
25
flagSweden
13%
5%
73%
7%
38
flagGermany
15%
5%
71%
7%
219
flagPoland
17%
4%
70%
7%
11990
flagthe United States
17%
1%
70%
10%
195
flagthe United Kingdom
16%
5%
67%
9%
385
flagAustria
0%
0%
66%
28%
21
flagRepublic of Ireland
13%
2%
63%
20%
44
flagNorway
9%
4%
63%
22%
22
flagUnknown
22%
6%
61%
9%
962
flagDenmark
14%
7%
57%
21%
14
flagIndia
24%
20%
44%
12%
25

Gender

men70%
women76%
Pope Gregory I, called the Great
17%
16%
St. Gregory the Illuminator
4%
2%
Pope Gregory XIII
70%
76%
Galileo
7%
5%

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Who introduced the Gregorian calendar?
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Author: Krzysztof Moskal
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