You now have the ecliptic longitude of perigee of the sun for the mean summer solstice of your chosen year (and effectively for the entire year).

你现在有黄道经度的近地点的阳光平均夏季冬至，你选择了一年(而有效地为整个一年)。

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Greenwich mean time (GMT) is mean solar time at the Royal Greenwich Observatory in Greenwich, London, England, which by convention is at 0 degrees geographic longitude.

格林尼治国际标准以英国伦敦格林威治皇家天文台为准，也就是零经度为准。

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