Kalenterivuosi
Kalenterivuosi, also known as a calendar year, is a period of 365 days, which is the time that Earth takes to orbit the Sun once. The calendar year is the basic unit of time for most societies, and its structure varies depending on the calendar system used. The most widely used calendar system is the Gregorian calendar, which was introduced in 1582 by Pope Gregory XIII. This calendar is a solar calendar, meaning it is based on the Earth's orbit around the Sun, and it has 12 months, each with a different number of days. The year begins on January 1st and ends on December 31st.
In the Gregorian calendar, a leap year occurs every four years to account for the fact that
The calendar year is divided into four seasons, each of which lasts approximately three months. The seasons
The calendar year is also used to measure time in many other contexts, such as in the