太たい陽よう周しゅう期き

noun

solar cycle

Astronomical term referring to the approximately 11-year cycle of solar activity, including sunspot frequency.

• 太たい陽よう周しゅう期きは約やく11年ねんごとに極きょく大だいを迎むかえる。

  The solar cycle reaches its maximum about every 11 years.