Calendar questions This is a list of recently added questions about calendar. Play calendar quiz and see all the questions. How many maximally times in year can happen Friday 13th (Gregorian calendar) ?3. Friday 13th can happen three times in in year when: year starts on Thursday or (leap year) on Sunday. Created by: lukasz Polandhard 42% 22693311244645521legends riddles » If in the month is Friday 13th:Will start on Sunday. If 1 is Sunday it this month will have Friday 13th.Created by: lukasz Polandvery hard 35% this month will have 30 or 31 day.this month will have 30 or 31 day.18will start on Sunday.will start on Sunday.68next month end up on Tuesday (excluding February)next month end up on Tuesday (excluding February)20All of the answers are correctAll of the answers are correct88curiosities riddles » 2st September is International Day......Blueberry Ice Cream. 2st September is International Day Blueberry Ice Cream. Day Without Underwear is 13th October, Day Islam - 27th February, Day Poor African Coutry doesn't exist. Created by: lukasz Polandvery hard 39% ...Without Underwear....Without Underwear.104...Blueberry Ice Cream....Blueberry Ice Cream.106...Islam....Islam.17...Poor African Country....Poor African Country.41author: lukasz Poland riddles » What is the meaning of the word "December", adopted from Latin by most of European languages?Tenth month. Originally Roman calendar was comprised only of 10 months. December was the 10th and last of them. Eventually a calendar reform introduced January and February, but preserved the ordinal naming convention of the older months.Created by: smyruvery hard 33% twelve monthtwelve month474tenth monthtenth month655last month of a yearlast month of a year483cold monthcold month359history of Europe riddles » Which country started using 7 days in week?Babylon. The seven-day week has deep historical origins in the astrology of Ancient Near East, being approximately a quarter of a lunation. It was (independently) adopted by the Persian Empire, in Judaism and in Hellenistic astrology, and (via Greek transmission) in Gupta India and Tang China.Created by: $#O!@Bhard 58% Ancient GreeceAncient Greece773Ancient EgyptAncient Egypt668Ancient IndiaAncient India370BabylonBabylon2509history riddles » Who introduced the Gregorian calendar?Pope Gregory XIII. 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.Created by: Krzysztof Moskaleasy 70% Pope Gregory I, called the GreatPope Gregory I, called the Great2531St. Gregory the IlluminatorSt. Gregory the Illuminator618Pope Gregory XIIIPope Gregory XIII10015GalileoGalileo1065popes riddles » Typically, how many leap years are in a century?24. The Gregorian Calendar omits 3 leap days every 400 years, omitting February 29 in the 3 century years (integer multiples of 100) that are not also integer multiples of 400. For example, 1600 was a leap year, but 1700, 1800 and 1900 were not. Similarly, 2000 was a leap year, but 2100, 2200, and 2300 will not be.Created by: ex-terminatorhard 42% 202014322424665225256907100100634math riddles » Which day was the last of the 20th century?31 Dec 2000. There was no year number zero. So, the first century started on 1 Jan 1. Similarly, 21th century started 1 Jan 2001.Created by: Jason Beagleyaverage 65% 31 Dec 199931 Dec 1999553831 Dec 200031 Dec 20001399031 Dec 200131 Dec 2001118431 Dec 189931 Dec 1899625time riddles » Augustus was born on 1 January 10BC. Which birthday did he celebrate at 1 January 10AD?19. There was no year number zero. There were only 1999 years between 1000BC and 1000AD.Created by: Gizem İsmailoğluvery hard 38% 1919680420206584212134638080915ancient history riddles » How many months have 31 days in them?7. January, March, May, July, August, October and December.Created by: Kasiahard 56% 552294662752779404882090mathematics riddles » Play mathematics quiz and see all the questions.