Which of the following is NOT a leap year?
- A.1600
- B.2000
- C.1900
- D.2400
Correct answer
Explanation
The correct answer is C, 1900. Under the Gregorian rule a year divisible by four is a leap year, but a century year is a leap year only if it is also divisible by 400. The year 1900 divides by 4 and by 100 but not by 400, so it had only 365 days. Option A, 1600, and option B, 2000, both divide by 400 and were therefore leap years of 366 days, which is why 29 February 2000 existed. Option D, 2400, divides by 400 and will also be a leap year. The same rule tells us that 1700, 1800 and 2100 are not leap years. This refinement is exactly what separates the Gregorian calendar from the Julian one, in which every fourth year without exception was a leap year, and it leaves 97 leap years in each cycle of 400.
Read the full article: Gregorian Calendar, Leap Years, Solstices and Equinoxes
Practice Questions
View allWho introduced the Gregorian calendar, which is in civil use across most of the world today?
- A.Julius Caesar
- B.Pope Gregory XIII
- C.Sosigenes of Alexandria
- D.Emperor Augustus
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He issued the bull Inter gravissimas in February 1582 and the new calendar took effect that October, correcting the drift that had built up in the older system and tightening the rule for leap years.
Read the full explanation →How many days were omitted from the calendar when the Gregorian reform came into force in October 1582?
- A.7 days
- B.10 days
- C.11 days
- D.13 days
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Thursday, 4 October 1582 was followed immediately by Friday, 15 October 1582, so ten dates vanished while the sequence of weekdays continued unbroken; the correction was needed because the Julian year of 365.25 days was about eleven minutes too long and had pushed the spring equinox ten days out of…
Read the full explanation →The Gregorian calendar was introduced to correct the errors of which earlier calendar?
- A.The Julian calendar
- B.The Saka calendar
- C.The Hijri calendar
- D.The Vikram Samvat
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The Julian calendar, in use from 46 BC, assumed a year of exactly 365.25 days, which is about eleven minutes longer than the true tropical year of roughly 365.2422 days, so it gained a day about every 128 years and the equinox slid out of place.
Read the full explanation →Which of the following calendars will be the same as the calendar for the year 2003?
- A.2014
- B.2013
- C.2012
- D.2011
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A year repeats another year's calendar when the odd days between them add up to a multiple of seven and both years are of the same kind, ordinary or leap.
Read the full explanation →If 14 January 2022 was Friday, then what will be the day of the week on 28 February 2025?
- A.Friday
- B.Monday
- C.Sunday
- D.Saturday
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Move forward one year at a time, adding one odd day for an ordinary span and two when a 29 February falls inside it.
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