立春，是二十四節氣中的第一個節氣，指太陽到達黃經315°時，為公曆每年2月3至5日之間，表示著春天的開始，按照正統或科學的觀點，屬相（生肖）以立春作為起始點。它也標誌著新一年及新一季的到來。從這一天一直到立夏這段期間，都稱為春季。

• 東風解凍：凍結於冬，遇春風而解散，不曰春而曰東者，《呂氏春秋》曰：「東方屬木。」木，火母也，火氣溫，故解凍。
• 蟄蟲始振：蟄，藏也；振，動也；蟄藏之蟲，因氣至而皆蘇動之矣。鮑氏曰：「動而未出，至二月乃大驚而走也。」
• 魚陟負冰：原為魚上冰，《元史志》改為魚陟負冰。陟，升也；魚當盛寒，伏水底而逐暖，至正月陽氣至，則上游而近冰，故曰負。

 The traditional East Asian calendars divide a year into 24 solar terms (節氣). Lìchūn (pīnyīn), Risshun (rōmaji), or Ipchun (romaja) (Chinese and Japanese: 立春;  literally: "start of spring") is the 1st solar term. It begins when the Sun reaches the celestial longitude of 315° and ends when it reaches the longitude of 330°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 315°. In the Gregorian calendar, it usually begins around February 4 and ends around February 18 (February 19 East Asia time). It's also the beginning of a Sexagenary cycle.