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Common Era and Before the Common Era are alternatives to the original Anno Domini (AD) and Before Christ (BC) notations used for the same calendar era. The two notation systems are numerically equivalent: "2025 CE" and "AD 2025" each describe the current year; "400 BCE" and "400 BC" are the same year. [1] [2] The expression can be traced back ...
Mid/late-2021 – Science first light of the Vera C. Rubin Observatory is anticipated for 2021 with full science operations to begin a year later. [23] [24] [25] Nancy Grace Roman Space Telescope, part of NASA's Exoplanet Exploration Program. Launch is tentatively scheduled for 2027.
Astronomers use the Julian calendar for years before 1582, including the year 0, and the Gregorian calendar for years after 1582, as exemplified by Jacques Cassini (1740), [2] Simon Newcomb (1898) [3] and Fred Espenak (2007). [4] The prefix AD and the suffixes CE, BC or BCE (Common Era, Before Christ or Before Common Era) are dropped. [1]
5000 BCE – Chinese discover fermentation through beer making. 6000 BCE – Yogurt and cheese made with lactic acid-producing bacteria by various people. 4500 BCE – Egyptians bake leavened bread using yeast. [1] 500 BCE – Moldy soybean curds used as an antibiotic. 300 BCE – The Greeks practice crop rotation for maximum soil fertility. [2]
1452/1453 mystery eruption in the New Hebrides arc, Vanuatu; the location of this eruption in the South Pacific is uncertain, as it has been identified from distant ice core records; the only pyroclastic flows are found at Kuwae; 36 to 96 km 3 (8.6 to 23.0 cu mi) of tephra; 175,000,000–700,000,000 t (193,000,000–772,000,000 short tons) of ...
Before Christ (BC), an epoch used in dating years prior to the estimated birth of Jesus; Before Common Era (BCE), an alternative naming of the traditional calendar era primarily used in academic circles; Before Present (BP), a timescale used mainly in geology; All pages with titles beginning with Before ; All pages with titles containing Before
The 1st century BC, also known as the last century BC and the last century BCE, started on the first day of 100 BC and ended on the last day of 1 BC. The AD/BC notation does not use a year zero; however, astronomical year numbering does use a zero, as well as a minus sign, so "2 BC" is equal to "year –1". 1st century AD (Anno Domini) follows.
alone: Display only the number of years and the calendar era according to the |main= parameter : E.g.: "AUC 964" number: Display only a natural number without any era: If |1= is a Gregorian year, the number returned equals the value of that year in the astronomical calendar plus 753; if |1= is an year Ab Urbe Condita, the number returned equals exactly the value of that year in the ...