In contemporary history, the third millennium is a period of time that began on January 1, 2001, and will end on December 31, 3000 of the Gregorian calendar. It is distinct from the millennium known as the 2000s which began on January 1, 2000 and will end on December 31, 2999.
As this millennium is currently in progress, the first two decades of the 21st century (the past 2000s and the current 2010s), are the subject of historians' attention. The remaining decades of the 21st century (2020s to 2090s) and the remaining centuries (22nd to 30th) are researched in futures studies. Here are some possible events that will happen in those particular years:
August 12, 2045 – A total solar eclipse will take place in the United States, producing a path from California to Florida. Some parts of Florida are predicted to experience totality for six minutes, the longest in US history.
October 27, 2088 – MercuryoccultsJupiter, the first time since 1708, but very close to the Sun and impossible to view with the naked eye.
September 23, 2090 – Total solar eclipse in the UK. The next total eclipse visible in the UK follows a track similar to that of August 11, 1999, but shifted slightly further north and occurring very near sunset. Maximum duration in Cornwall will be 2 minutes and 10 seconds. Same day and month as the eclipse of September 23, 1699.
April 7, 2094 – Mercury occults Jupiter; it will be very close to the Sun and impossible to view with the naked eye.
May 6, 2492 – Belgian astronomerJean Meeus asserts that the orbits of all eight planets and Pluto will be within the same 90° arc of the Solar System. The last time this is believed to have occurred was on February 1, 949.
September 3, 2650 – The distance between Mars and the Earth will arrive at a new remarkable minimum, at 55,651,582.118km. It will be the closer encounter of perihelitic opposition slightly shorter (by 37,000km) than the previous one of the August 28, 2287. The following closer encounter will be on September 8, 2729.
2699/2700 – Triple conjunctions between Mars-Jupiter, Mars-Neptune and Jupiter-Neptune.
October 24, 2714 – Transit of Jupiter from Uranus. First one since May 3, 1914.
September 8, 2729 – The distance between Mars and the Earth will arrive at a new remarkable minimum, at 55,651,033.122km. It will be the closer encounter of perihelitic opposition slightly shorter (just 549km) than the previous one of the September 3, 2650.
2096 is the last leap year before 2100, which will not be a leap year.
On March 1, 2100 (which will be February 16, 2100 in the Julian calendar), the difference between the Julian calendar and the Gregorian calendar reaches 14 days. Since 14 is divisible by 7, this will be the first time in history since its inception that the Gregorian calendar will have the same day of the week for each day of the month for the whole year as the Julian calendar. This will last until February 28, 2200 of the Gregorian Calendar.
2100 will not be a leap year since it qualifies as a year that is divisible by 100, but not by 400.
FAT file systems theoretically support dates up to December 31, 2107 (though officially only up to December 31, 2099).
The Year type in MySQL supports dates up to December 31, 2155.
March 17, 2160 – Unless changes are made as to when Easter can be observed, this particular March 17 will fall within Holy Week for the first time since 2008 and fall on the same day (Monday) as it did in that year, likely requiring the movement of the Feast of Saint Patrick's Day to another date.
Unless changes are made in the religious calendar, in 2285, the Western Easter will fall on March 22 for the first time since 1818, the earliest possible date on which Easter can occur.
The United Kingdom could have the largest population in Europe by 2050 and be the third biggest recipient of migrants in the world, UN projections suggest.
2050s – China, United States, India, Brazil and Mexico will be the largest economies in the world, according to a Goldman Sachs study.
2160 – Some scientists believe there are babies born in 2010 who may still be alive in 2160.
According to the UN Population Bureau, life expectancy in 2200 is predicted to be around 100 for developed countries and the world population is estimated to be about 8.5 billion. The UN says that these projections could be invalidated by changes and progression in future life extension technology and discoveries, as well as changes in future birthrates.
22nd century – In his book The Next 100 Years, American political scientist George Friedman predicts that as the century begins, an ongoing confrontation between an increasingly powerful Mexico and the United States will be taking place. Mexico will be an economically and militarily powerful country capable of challenging the United States, while a Mexican majority in southern regions of the United States will have made them a de facto extension of Mexico, with increasing secessionist sentiment. Both countries will be competing for dominance over North America, which will remain the international center of gravity throughout the next few centuries.