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Jan 25, 2022 · Retirement. Old age. Early adulthood. Middle age. early career. Cultural change. Adulthood. Register now. Views of the stages of adulthood are stuck in the early 20th century, even though they ...
- Jeffrey Arnett
- How long has our calendar been around?
- B.C. or B.C.E.?
- Circa?
- Why 2012 is in the 21st Century
We are writing this on 12/26/12 or Wednesday, December 26, 2012. Traditionally understood as two-thousand and twelve years (give or take a few) after Jesus Christ is believed to have been born. But if Jesus used a calendar, it would not have been the one we use.
Our calendar is called the Gregorian calendar and was instituted by Pope Gregory XIII in 1582. There are many other calendars. Quite a few societies have used calendars linked to the years their kings ruled. And there are numerous calendars, beyond the Gregorian calendar, that are still in use today. For example, 2012 equates to 1434/35 in the Islamic calendar and 5772-73 in the Jewish calendar (both are lunar, based on the cycles of the moon).
Many people use the abbreviations B.C. and A.D. with a year (for example, A.D. 2012). B.C. refers to "Before Christ," and the initials, A.D., stand for Anno Domini, which is Latin for "In the year of our Lord." This system was devised by a monk in the year 525.
A more recent system uses B.C.E. which stands for "Before the Common Era" and C.E. for "Common Era." This newer system is now widely used as a way of expressing the same periods as B.C. and A.D., but without the Christian reference. According to this system, we count time backwards Before the Common Era (B.C.E.) and forwards in the Common Era (C.E.).
Often dates will be preceded with a "c." or a "ca." These are abbreviations of the Latin word "circa" which means around, or approximately. We use this before a date to indicate that we do not know exactly when something happened, so c. 400 B.C.E. means approximately 400 years Before the Common Era.
We live in the 21st Century, that is, the 2000s. Similarly when we say "20th Century," we are referring to the 1900s. All this because, according to the calendar we use, the 1st Century included the years 1-100 (there was no year zero), and the 2nd Century, the years 101-200. Similarly, when we say 2nd Century B.C.E. we are referring to the years 200-101 B.C.E.
Within our calendar, we also have a tendency to find portentous meaning in the millennial years, that is, in the years 1000 and more recently, 2000.
From smartphones to social media and healthcare, here's a brief history of the 21st century's technological revolution. Just over 20 years ago, the dotcom bubble burst, causing the stocks of many tech firms to tumble. Some companies, like Amazon, quickly recovered their value – but many others were left in ruins.
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In this review, we summarize and critically evaluate the major empirical, conceptual, and theoretical directions that social scientific studies of aging families have taken during the first decade of the 21st century.
- Merril Silverstein, Roseann Giarrusso
- 2010
Mar 29, 2022 · As a starting point for discussion, the McKinsey Health Institute (MHI) believes that over the next decade humanity could add as many as 45 billion extra years of higher-quality life—roughly six years per person on average, and substantially more in some countries and populations.1.
Aug 2, 2021 · 2021 is different from years prior, even more so when compared to five years ago. It used to be that five years did not bear much of a change. But with how rapidly the world is evolving, many changes affect everyone’s lifestyles. The points below summarize what the 21st-century lifestyle is like, especially when compared to years ago.
In 2021, the global average life expectancy was just over 70 years. This is an astonishing fact – because just two hundred years ago, it was less than half. This was the case for all world regions: in 1800, no region had a life expectancy higher than 40 years. The average life expectancy has risen steadily and significantly across all regions. 1
