The calendar has 12 months a year, but many people do not know the origins of the 12 months' name. The Gregorian calendar originates in the ancient Roman calendar. There are 10 months in the Ancient Roman English, and Roman emperor decided to increase two months on the end of the year. Later, Julius Caesar moves the two months to the beginning of the year. The original first month and second month became the third month and forth month, and so on. Today, this is the world adopted the Gregorian calendar.
In 1928, the International Astronomical Union, a special committee designated all the 88 constellations of the exact boundary contour. Each of them will be designated to each star in the constellation that it belongs to. There are 13 constellations cross the celestial of the equator. Usually, we recognize 12 constellations.
The names of months and constellations are mainly comes from Greek Mythology and Roman Mythology. It contains deep cultural connotation, which is difficult to understand literally. Therefore, understanding the ins and outs of them has a great help for learning English.
The origins of the months' English names.
In ancient Roman mythology, Janus is known as the god of time. He has two faces, one face for looking back, the other one for viewing the future. Starting from the era before the first century Roman combine the festival of the sacrifice Janus and the New Year together. To commemorate Janus, the Roman people name the first month as Januarius (mensis), which means the month of Janus. English borrowed the word. First it has been written as Januarie, later changes to January. People believe that it is meaningful to choose his name to be the name of New Year's month. January is the month that people look to the future and recalling the old year.