节气算法（已经过验证）-大家顶上去，直到llhn大侠关注

sun_west

今天抽了一点时间，写了以下计算节气的算法，2005年的节气均验证过，正确无误
大家顶上去，直到llhn大侠关注

/// <summary>
/// C#源代码：根据阳历日期，计算节气，返回节气名称
/// </summary>
/// <param name="day">阳历日期</param>
/// <returns>节气名称</returns>
public static string GetSolarTerm(System.DateTime day)
{
        //节气名称数组
        string[] TermName = new string[]
                {
                        "小寒","大寒","立春","雨水","惊蛰","春分","清明","谷雨","立夏","小满","芒种","夏至",
                        "小暑","大暑","立秋","处暑","白露","秋分","寒露","霜降","立冬","小雪","大雪","冬至"
                };
        //各节气和小寒相差的分钟数（因为只有分钟的数据，所以仅精确到分钟）
        int[] TermOffsetInMinute = new int[]
                {
                        0,21208,42467,63836,85337,107014,128867,150921,173149,195551,218072,240693,
                        263343,285989,308563,331033,353350,375494,397447,419210,440795,462224,483532,504758
                };
        //一个节气年的毫秒长度
        double TermYearLengthInMS = 31556925974.7;
        //基准节气时刻（1900年小寒）
        System.DateTime BasicTerm = System.DateTime.Parse("1900-01-06 02:05:00");

        //计算今年小寒所在的日期
        System.DateTime CurrentTerm0 = BasicTerm.AddMilliseconds( TermYearLengthInMS * ( day.Year - 1900 ) );
        //计算当前日期和小寒日期相差的分钟数
        System.TimeSpan dayMinute = day - CurrentTerm0;
        double dayMinuteFrom = dayMinute.TotalMinutes;
        double dayMinuteTo = dayMinuteFrom + 60 * 24;

        //遍历每个节气，找出在当前日期24小时范围内的节气
        for (int i=0;i<TermName.Length;i++)
        {
                if ( dayMinuteFrom <= TermOffsetInMinute[i] && dayMinuteTo > TermOffsetInMinute[i] )
                {
                        //找到节气，返回节气名称
                        return TermName[i];
                }
        }
        //找不到节气，说明当前日期并非节气日
        return "";
}