中华万年历

春分是二十四节气中的第四个节气,通常在每年公历3月20-22日交节,此时太阳到达黄经0度(或360度)。春分之"分"有两层含义:一是季节平分,春分正处于立春到立夏九十天的中间,平分了春季;二是昼夜平分,春分这一天,太阳直射赤道,全球各地昼夜等长,各为12小时。春分时节,北斗星柄指向正东卯位,标志着春季的天文中点。春分后,太阳直射点继续北移,北半球白昼渐长夜渐短,气温持续回升。在天文学上,春分是春季的真正开始,也是北半球春天和南半球秋天的分界点。

Spring Equinox (Chunfen) is the fourth solar term of the 24 solar terms, occurring around March 20-22 when the sun reaches 0 degrees (or 360 degrees) celestial longitude. The "fen" (分) in Chunfen has two meanings: first, it equally divides the season - Spring Equinox sits exactly in the middle of the ninety days between Start of Spring and Start of Summer, bisecting spring; second, it equally divides day and night - on Spring Equinox day, the sun directly illuminates the equator, making day and night equal length worldwide at 12 hours each. During Spring Equinox, the Big Dipper's handle points directly east to the Mao position, marking spring's astronomical midpoint. After Spring Equinox, the sun's direct point continues moving north, Northern Hemisphere days gradually lengthen while nights shorten, and temperatures continue rising. Astronomically, Spring Equinox marks spring's true beginning and serves as the boundary between spring in the Northern Hemisphere and autumn in the Southern Hemisphere.