じてんしゅうき
自転周期
1. rotation periodAstronomy
2. Rotation periodThe rotation period of an astronomical object is the time that it takes to complete one revolution around its axis of rotation relative to the background stars. It differs from the planet's solar day, which includes an extra fractional rotation needed to accommodate the portion of the planet's orbital period during one day.
Read “Rotation period” on English Wikipedia
Read “自転周期” on Japanese Wikipedia
Read “Rotation period” on DBpedia
Read “Rotation period” on English Wikipedia
Read “自転周期” on Japanese Wikipedia
Read “Rotation period” on DBpedia
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