The Historical Journey of Calendars

History · 10 questions

Reforms, cycles, and rules of specific calendar systems.

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1. In which year was the Gregorian calendar reform promulgated?

   1. 1600
   2. 1492
   3. 1700
   4. 1582
   Show the answer

   D) 1582

2. What is the mean year length in the Julian calendar?

   1. 365.5 days
   2. 365.25 days
   3. 365.2425 days
   4. 365 days
   Show the answer

   B) 365.25 days

3. How long is the Metonic cycle?

   1. 19 years
   2. 33 years
   3. 30 years
   4. 28 years
   Show the answer

   A) 19 years

4. How many leap years are in the Islamic calendar's 30-year arithmetic cycle?

   1. 11
   2. 7
   3. 10
   4. 12
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   A) 11

5. Which month is added in a Hebrew leap year?

   1. Nisan
   2. Adar II
   3. Adar I
   4. Elul
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   B) Adar II

6. How long is the Chinese cycle of heavenly stems and earthly branches?

   1. 30 years
   2. 12 years
   3. 10 years
   4. 60 years
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   D) 60 years

7. Under the Gregorian calendar, which century years are leap years?

   1. Those divisible by 100
   2. Those divisible by 400
   3. Those divisible by 200
   4. Those divisible by 50
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   B) Those divisible by 400

8. According to ISO 8601, which date must a year's week 1 include?

   1. December 31
   2. January 1
   3. January 7
   4. January 4
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   D) January 4

9. How many calendar dates were omitted in October 1582 where the Gregorian reform was applied?

   1. 13 dates
   2. 7 dates
   3. 10 dates
   4. 11 dates
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   C) 10 dates

10. How many days were in an ancient Egyptian civil year?

    1. 364 days
    2. 366 days
    3. 365 days
    4. 360 days
    Show the answer

    C) 365 days