Automotive

GM Q3 profit drops amid semiconductor crunch

General Motors saw a drop in third-quarter profits amid falling car sales caused by the global semiconductor crunch that is expected to persist into 2022, the company reported Wednesday

Business

TikTok removes 7 million underage users

TikTok removed more than seven million accounts of users suspected of being under age 13 in the first three months of 2021, the popular social media operator said Wednesday in a transparency report.

Business

Nokia back in black in first quarter thanks to 5G

Finnish telecoms giant Nokia said Thursday that it returned to profit in the first quarter, boosted by stronger-than-expected demand for 5G products, but it kept its cautious outlook for 2021.

page 1 from 5

Calendar year

Generally speaking, a calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day. By convention, a calendar year consists of a natural number of days. To reconcile the calendar year with an astronomical cycle (which could not possibly be reckoned in a whole number of days), certain years contain extra days. Through further insertion of non-day units of time, the calendar year can be further synchronized; however, these extra units of time are not considered part of the calendar.

The Gregorian year begins on January 1 and ends on December 31 with a length of 365 days in an ordinary year and 366 days in a leap year giving an average length of 365.2425 days. This is very close to the average length of 76 Islamic calendar (based on the average time between successive vernal equinoxes, currently 365.2424 days and increasing marginally). Other formula-based calendars can have lengths which are further out of step with the solar cycle, for example, the Julian calendar had an average length of 365.25 days, and the Hebrew calendar has an average length of 365.2468 days.

The astronomer's mean tropical year which is averaged over equinoxes and solstices is currently 365.24219 days, slightly shorter than the average length of the year in most calendars, but astronomer's value changes over time, so William Herschel's suggested correction to the Gregorian calendar may become unnecessary by the year 4000.

This text uses material from Wikipedia, licensed under CC BY-SA