History & info - Overview of information about our year
โลกเราหมุนเร็วขึ้นทุกวันๆ จริงด้วย
Our concept of a year is based on the earth's motion around the sun. The time from one fixed point, such as a solstice or equinox, to the next is called a tropical year. Its length is currently 365.242190 days, but it varies. Around 1900 its length was 365.242196 days, and around 2100 it will be 365.242184 days. (This definition of the tropical year is not quite accurate, see section astronomic issues for more details.)
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