1. Year facts for kids

          Kids Encyclopedia Facts

          One year is about 365 days long (except in a leap year). It is the time it takes the Earth to go completely around (orbit) the sun once. A year is actually 365ΒΌ days long, but a calendar has 365 days, except in a leap year.

          The year starts on January 1 and ends on December 31 in the Gregorian calendar, but a fiscal year or a school year can start on a different day of the year.

          There are several ways used to measure the length of a year.

          • a solar year is based on the seasons. The Gregorian calendar is based on the solar year. The solar year is 365 days long.
          • a lunar year is based on the moon and is usually 12 lunar months (29 days, 12 hours, 44 minutes each) or 354 days long.
          • a tropical year is the time between two vernal equinoxes, the first day of spring when the lengths of daylight and night are the same.
          • a sidereal year measures the time between when a selected fixed star is highest in the night sky.
          • an anomalistic year is the difference between the times when the Earth gets closest to the sun.
          • an eclipse year is the time between node passages. This is when the sun moves through a part of the sky where it is possible for the sun, Earth and moon to be in a line. It is also when solar eclipses can happen.

          Solar and lunar years are used by different societies in daily life. The other measurements are used by astronomers.

          • there was no year numbered "year zero" in a normal system of counting, because it would mean there is a year earlier than the first year, which was the year AD one in the Anno Domini system, also called 1 CE in the Common Era, used with our Gregorian calendar. However, some astronomers call the year 1 BC (or BCE) "year 0" to make it easier for them to count leap years before that year.
          Months of the Year

          January | February | March | April | May | June | July | August | September | October | November | December


          Year Facts for Kids. Kiddle Encyclopedia.

              1. http://www.mh8dociw.tw | http://m.mh8dociw.tw | http://wap.mh8dociw.tw | http://3g.mh8dociw.tw | http://4g.mh8dociw.tw | http://5g.mh8dociw.tw | http://mobile.mh8dociw.tw | http://vip.mh8dociw.tw | http://ios.mh8dociw.tw | http://anzhuo.mh8dociw.tw | http://0d.mh8dociw.tw | http://3617.mh8dociw.tw | http://526d11.mh8dociw.tw | http://ce29a.mh8dociw.tw | http://c4e2.mh8dociw.tw | http://36.mh8dociw.tw | 黑帮文笔好的带肉言情