|Stamp Title:||Spring, Summer, Autumn and Winter|
|Value in Set：||4|
|Date of Issue:||2017-03-20|
|Size of Stamp:||30×50mm|
|Sheet Composition:||16 for Layout Ⅰ and 8 for Layout Ⅱ|
|Printer:||XBeijing Stamp Printing House|
|Printing Process:||Heliographic printing|
People measured the day’s rotation with the apparent motion of the sun in ancient times, determined the length of the month using the moon’s cycles, and defined the four seasons in conjunction with the sun and star images, forming the characteristic Chinese seasons and their divisions.
A year was explicitly divided into spring, summer, autumn and winter in the Proceedings of Government in the Different Months, a volume in the Book of Rites , a collection of descriptions of ritual matters written during the late Warring States (5th cent.-221 BCE) and Former Han (206 BCE-8 CE) periods.
Every season is divided into three months, making the division more objective and scientific. The division of four seasons reflects ancient people’s thoughts on the unity of heaven, earth and man.