1.    The Islamic Hijra Calendar is based on the movement of which celestial body?

2.    When does the vernal equinox, the time day and night are equal all over the world, occur every year?

3.    A leap year contains which extra date that is not found in other calendar years?

4.    When does the summer solstice, the time when the hours of daylight are longest, occur every year?

5.    When was the Gregorian Calendar, the calendar used by most of the Western world, first established?

6.    Who established the first 365-day calendar?

7.    Which Roman emperor ordered the reform of the Roman Calendar due to which a new one came into effect on January 1, 46 BC?

8.     How many days are there in an Islamic Calendar?

9.    Gregorian Calendar was accepted in China only in the last century, do you know which year it was?

10.    In which year did Atomic Time replace Earth Time as the world’s official scientific time standard?— Rehan Jalal

Answers:

1.    Moon

2.    About March 20/21, it is also known as Spring equinox in the Northern Hemisphere and autumnal equinox in the Southern Hemisphere.

3.    February 29

4.    About June 21

5.    582AD

6.    Ancient Egyptians

7.    Julius Caesar

8.    Either 354 or 355 days

9.    1949

10.    1972