在古代天文学中，水曜是水星的别称，常与金曜、火曜等名称并列。
In ancient astronomy, 水曜 was another name for Mercury and was often listed alongside names such as 金曜 and 火曜.
In ancient astronomy, 水曜 was another name for Mercury and was often listed alongside names such as 金曜 and 火曜.