Time questions This is a list of recently added questions about time. Play time quiz and see all the questions. 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 Great2130St. Gregory the IlluminatorSt. Gregory the Illuminator495Pope Gregory XIIIPope Gregory XIII8207GalileoGalileo891popes riddles » What is the stellar day?23 h 56 min 05 s. Sidereal time is a time-keeping system astronomers use to keep track of the direction to point their telescopes to view a given star in the night sky. It is a time scale that is based on the Earth's rate of rotation measured relative to the fixed stars rather than the Sun. Created by: Krzysztof Moskalaverage 64% 23 h 56 min 05 s23 h 56 min 05 s438024 h 10 min 07 s24 h 10 min 07 s130325 h 22 min 09 s25 h 22 min 09 s67926 h 05 min 11 s26 h 05 min 11 s431stars riddles » What is the highest time zone?UTC+14. Time zones range from UTC-12 to UTC+14. UTC+14 stretches as far as 30° east of the 180° longitude line and creates a large fold in the International Date Line. In Kiribati (UTC+14), the local time is the same as in Hawaiʻi (UTC−10:00), but the date is one day ahead. It is also 26 hours ahead of Baker Island (UTC−12:00).Created by: globalquiz.orgvery hard 32% UTC0UTC01372UTC+12UTC+123361UTC+14UTC+143191UTC+24UTC+241830Oceania riddles » Which large country uses UTC +5:30 time zone?India is one of the few countries that use single time zone with a 30-minute increment from UTC. The country's east–west distance covers 28 degrees of longitude, resulting in two hours difference in astronomical time. Since authorities decided to have one time zone for the whole country, they had to adjust it precisely.Created by: globalquiz.orghard 47% ChinaChina3769IranIran2271IndiaIndia7333BrazilBrazil2195geography of India riddles » Which of these countries first celebrate New Year?Australia. Sydney Time Zone is +10:00, so they celebrate New Year 4 and a half hours before India (+5:30), 10 hours before London, and 17 hours before Los Angeles (-7:00) .Created by: Cleovery easy 81% United StatesUnited States691United KingdomUnited Kingdom268IndiaIndia411AustraliaAustralia5963Australia 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 1999507731 Dec 200031 Dec 20001263931 Dec 200131 Dec 2001109031 Dec 189931 Dec 1899575calendar riddles » What was the exposure time of this photo?About 1 hour. The length of stars trails is pretty much the same as the distance travelled by an hour hand of clock during 30 minutes. But the Earth rotates twice as slow compared to the hour hand of a clock (one rotation per day, while clock's hour hand makes two).Created by: globalquiz.orgvery hard 35% about 10 secondsabout 10 seconds1195about 10 minutesabout 10 minutes869about 1 hourabout 1 hour2493about 8 hoursabout 8 hours2455photography riddles » World's fastest high-speed cameras were built to take photos of specific objects. What kind of objects?Nuclear bomb explosions. The rapatronic cameras are capable of recording a still image with an exposure time as brief as 10 nanoseconds (that would give 100 million frames per second if the camera was capable to do multiple pictures). The camera uses two polarizing filters mounted with their polarization angles at 90° to each other and a Faraday cell which briefly changes the polarization plane of light passing through it, acting as a shutter.Created by: Cleohard 45% bullet shotsbullet shots1695rocket launchesrocket launches814nuclear bomb explosionsnuclear bomb explosions4038sound wavessound waves2250technology riddles » During a full 24-hour day, how many times would the hands of a clock overlap?22. The minute hand makes 24 revolutions, while the hour hand makes 2 revolutions.Created by: globalquiz.orgvery hard 31% 66592121219462222284224243598geometry riddles » What are the most luminous objects in the universe?Quasars. A quasar is an extremely energetic source of radiation powered by accretion disc around galaxy's central supermassive black hole. Quasars were much more common in the early universe, as all known quasars are extremely distant.Created by: globalquiz.orghard 41% supergiant starssupergiant stars822novaenovae401supernovaesupernovae4859quasarsquasars4256universe riddles » Play technology quiz and see all the questions.