Now we also need to determine the ecliptic longitude of perigee of the sun on this same day.This changes very slowly, thus we need know only the year to compute it with sufficient accuracy.

• 现在，我们还需要确定黄道经度的近地点的太阳就这同一天，这变化非常缓慢，因此，我们需要知道，只有今年来计算，它有足够的精度。