わくせいちょくれつ 惑星直列 LinksSentence search for 惑星直列Sentence search for わくせいちょくれつKanji details for 惑, 星, 直 and 列Edit in JMdict Noun1. planetary alignment; syzygyAstronomyWikipedia definition2. Syzygy (astronomy) Discussions Log in to talk about this word.