系统直接计算出任意一点在给定时刻的太阳高度角、太阳方位角、太阳赤纬角、当天日照时间、全年日照时间以及年平均日照时间等。
System directly calculate any point at a given moment in the sun elevation Angle, solar azimuth, solar declination Angle, the day of sunshine, year round sunshine and average annual sunshine time.
然后报告会和来自德国天气学会的数据作对比。天气会的数据包括了各种天气变量：平均气温，风力和日照时间。
These reports were then compared with data from the German weather Institute, which was combined to create weather variables: average temperature, wind power and number of hours sunlight.
伦敦五月份每天平均有7.6小时日照时间。
London has on average 7.6 hours of sunshine per day during May.
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