also: すいきんちかもくどってんかい
noun
mnemonic for the solar system planets
A mnemonic phrase listing the planets in order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Used primarily in educational contexts.
小学生のとき、「水金地火木土天海」で惑星の順番を覚えた。
In elementary school, I memorized the order of the planets with 'Suikin Chikamoku Dotenkai'.
A mnemonic phrase formed by taking the first character of each planet's Japanese name: 水星 (Mercury), 金星 (Venus), 地球 (Earth), 火星 (Mars), 木星 (Jupiter), 土星 (Saturn), 天王星 (Uranus), 海王星 (Neptune).