Rainbow in spring

English follows Japanese. 二十四節気は清明。春の虹　雲平・琥珀製。 Haru no niji (Rainbow in spring), Higashi(Unpei and Kohakutou). "Seimei", one of the twenty-four periods of the solar year, begins on April 5th. The air gradually becomes more humid in spring. Then, after the rain Rainbows are often seen. Since the sunlight is still weak in spring, the rainbow is pale and ephemeral.