计算日落日出时间算法与代码代码,Java代码库,德仔网

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【Java】计算日落日出时间算法与代码
作者: / 发布于2016/11/8/ 394
public class SunRiseSet {
private static int[] days_of_month_1={31,28,31,30,31,30,31,31,30,31,30,31};
private static int[] days_of_month_2={31,29,31,30,31,30,31,31,30,31,30,31};
private final static double h= -0.833;//日出日落时太阳的位置
private final static double UTo=180.0;//上次计算的日落日出时间，初始迭代值180.0
    //输入日期
//输入经纬度
//判断是否为闰年：若为闰年，返回1；若不是闰年,返回0
public static boolean leap_year(int year){ 
    if(((year%400==0) || (year%100!=0) && (year%4==0))) return true; 
    else return false; 
} 
//求从格林威治时间公元2000年1月1日到计算日天数days 
public static int days(int year, int month, int date){  
    int i,a=0;  
    for(i=2000;i<year;i++){  
        if(leap_year(i)) a=a+366;  
        else a=a+365;  
    }  
    if(leap_year(year)){  
        for(i=0;i<month-1;i++){ 
            a=a+days_of_month_2[i];  
        } 
    }else {  
        for(i=0;i<month-1;i++){ 
            a=a+days_of_month_1[i]; 
        }  
    }  
    a=a+date;  
    return a;  
}
//求格林威治时间公元2000年1月1日到计算日的世纪数t 
public static double t_century(int days,  double UTo){  
    return ((double)days+UTo/360)/36525;  
} 
//求太阳的平黄径
public static double L_sun(double t_century){  
    return (280.460+36000.770*t_century);  
}
//求太阳的平近点角
public static double G_sun(double t_century){  
    return (357.528+35999.050*t_century);  
}
//求黄道经度
public static double ecliptic_longitude(double L_sun,double G_sun){  
    return (L_sun+1.915*Math.sin(G_sun*Math.PI/180)+0.02*Math.sin(2*G_sun*Math.PI/180)); 
}
//求地球倾角
public static double earth_tilt(double t_century){  
    return (23.4393-0.0130*t_century);  
} 
//求太阳偏差
public static double sun_deviation(double earth_tilt,double ecliptic_longitude){  
    return (180/Math.PI*Math.asin(Math.sin(Math.PI/180*earth_tilt)*Math.sin(Math.PI/180*ecliptic_longitude)));  
}
//求格林威治时间的太阳时间角GHA
public static double GHA(double UTo,double G_sun,double ecliptic_longitude){  
    return (UTo-180-1.915*Math.sin(G_sun*Math.PI/180)-0.02*Math.sin(2*G_sun*Math.PI/180)+2.466*Math.sin(2*ecliptic_longitude*Math.PI/180)-0.053*Math.sin(4*ecliptic_longitude*Math.PI/180)); 
} 
//求修正值e
public static double e(double h,double glat,double sun_deviation){  
    return 180/Math.PI*Math.acos((Math.sin(h*Math.PI/180)-Math.sin(glat*Math.PI/180)*Math.sin(sun_deviation*Math.PI/180))/(Math.cos(glat*Math.PI/180)*Math.cos(sun_deviation*Math.PI/180)));  
} 
//求日出时间
public static double UT_rise(double UTo,double GHA,double glong,double e){  
    return (UTo-(GHA+glong+e));  
} 
//求日落时间
public static double UT_set(double UTo,double GHA,double glong,double e){  
    return (UTo-(GHA+glong-e)); 
}
//判断并返回结果（日出）
public static double result_rise(double UT,double UTo,double glong, double glat, int year, int month, int date){  
    double d;  
    if(UT>=UTo) d=UT-UTo;  
    else d=UTo-UT;  
    if(d>=0.1) {  
        UTo=UT;  
        UT=UT_rise(UTo,
            GHA(UTo,G_sun(t_century(days(year,month,date),UTo)),
                    ecliptic_longitude(L_sun(t_century(days(year,month,date),UTo)),
                    G_sun(t_century(days(year,month,date),UTo)))),
        glong,
        e(h,glat,sun_deviation(earth_tilt(t_century(days(year,month,date),UTo)),
            ecliptic_longitude(L_sun(t_century(days(year,month,date),UTo)),
            G_sun(t_century(days(year,month,date),UTo))))));  
        result_rise(UT,UTo,glong,glat,year,month,date); 
 
    }  
    return UT;  
} 
//判断并返回结果（日落）
public static double result_set(double UT,double UTo,double glong,double glat, int year, int month, int date){  
    double d;  
    if(UT>=UTo) d=UT-UTo;  
    else d=UTo-UT;  
    if(d>=0.1){  
        UTo=UT;  
        UT=UT_set(UTo,
          GHA(UTo,G_sun(t_century(days(year,month,date),UTo)),
          ecliptic_longitude(L_sun(t_century(days(year,month,date),UTo)),
          G_sun(t_century(days(year,month,date),UTo)))),
          glong,
          e(h,glat,sun_deviation(earth_tilt(t_century(days(year,month,date),UTo)),
          ecliptic_longitude(L_sun(t_century(days(year,month,date),UTo)),
          G_sun(t_century(days(year,month,date),UTo))))));  
        result_set(UT,UTo,glong,glat,year,month,date);  
    }  
    return UT;  
}
//求时区
public static int Zone(double glong){  
    if(glong>=0) return (int)((int)(glong/15.0)+1);  
    else return (int)((int)(glong/15.0)-1); 
} 
//打印结果 
// public static void output(double rise, double set, double glong){  
//     if((int)(60*(rise/15+Zone(glong)-(int)(rise/15+Zone(glong))))<10)  
//         System.out.println("The time at which the sunrise is: "+(int)(rise/15+Zone(glong))+":"+(int)(60*(rise/15+Zone(glong)-(int)(rise/15+Zone(glong))))+" .\n");  
//     else System.out.println("The time at which the sunrise is: "+(int)(rise/15+Zone(glong))+":"+(int)(60*(rise/15+Zone(glong)-(int)(rise/15+Zone(glong))))+" .\n");
//      
//     if((int)(60*(set/15+Zone(glong)-(int)(set/15+Zone(glong))))<10) 
//         System.out.println("The time at which the sunset is: "+(int)(set/15+Zone(glong))+": "+(int)(60*(set/15+Zone(glong)-(int)(set/15+Zone(glong))))+" .\n");  
//     else System.out.println("The time at which the sunset is: "+(int)(set/15+Zone(glong))+":"+(int)(60*(set/15+Zone(glong)-(int)(set/15+Zone(glong))))+" .\n"); 
// } 
public static String getSunrise(GeoPoint geoPoint,Time sunTime){
double sunrise,glong,glat;
int year,month,date;
year=sunTime.year;
month=sunTime.month;
date=sunTime.monthDay;
glong=geoPoint.getLongitude();
glat=geoPoint.getLatitude();

sunrise=result_rise(UT_rise(UTo,
                 GHA(UTo,G_sun(t_century(days(year,month,date),UTo)),
                        ecliptic_longitude(L_sun(t_century(days(year,month,date),UTo)),
                        G_sun(t_century(days(year,month,date),UTo)))),
            glong,
            e(h,glat,sun_deviation(earth_tilt(t_century(days(year,month,date),UTo)),
            ecliptic_longitude(L_sun(t_century(days(year,month,date),UTo)),
        G_sun(t_century(days(year,month,date),UTo)))))),UTo,glong,glat,year,month,date);
//System.out.println("Sunrise is: "+(int)(sunrise/15+Zone(glong))+":"+(int)(60*(sunrise/15+Zone(glong)-(int)(sunrise/15+Zone(glong))))+" .\n");
Log.d("Sunrise", "Sunrise is: "+(int)(sunrise/15+8)+":"+(int)(60*(sunrise/15+8-(int)(sunrise/15+8)))+" .\n");
        //return "Sunrise is: "+(int)(sunrise/15+Zone(glong))+":"+(int)(60*(sunrise/15+Zone(glong)-(int)(sunrise/15+Zone(glong))))+" .\n";
        return "Sunrise is: "+(int)(sunrise/15+8)+":"+(int)(60*(sunrise/15+8-(int)(sunrise/15+8)))+" .\n";
}
public static String getSunset(GeoPoint geoPoint,Time sunTime){
double sunset,glong,glat;
int year,month,date;
year=sunTime.year;
month=sunTime.month;
date=sunTime.monthDay;
glong=geoPoint.getLongitude();
glat=geoPoint.getLatitude();
sunset=result_set(UT_set(UTo,
                GHA(UTo,G_sun(t_century(days(year,month,date),UTo)),
                  ecliptic_longitude(L_sun(t_century(days(year,month,date),UTo)),
               G_sun(t_century(days(year,month,date),UTo)))),
                glong,
                e(h,glat,sun_deviation(earth_tilt(t_century(days(year,month,date),UTo)),
                  ecliptic_longitude(L_sun(t_century(days(year,month,date),UTo)),
               G_sun(t_century(days(year,month,date),UTo)))))),UTo,glong,glat,year,month,date);
//System.out.println("The time at which the sunset is: "+(int)(sunset/15+Zone(glong))+":"+(int)(60*(sunset/15+Zone(glong)-(int)(sunset/15+Zone(glong))))+" .\n");
Log.d("Sunset", "Sunset is: "+(int)(sunset/15+8)+":"+(int)(60*(sunset/15+8-(int)(sunset/15+8)))+" .\n");
       //return "Sunset is: "+(int)(sunset/15+Zone(glong))+":"+(int)(60*(sunset/15+Zone(glong)-(int)(sunset/15+Zone(glong))))+" .\n";
       return "Sunset is: "+(int)(sunset/15+8)+":"+(int)(60*(sunset/15+8-(int)(sunset/15+8)))+" .\n";
}
}
//SunRiseSet.getSunRise(GeoPoint geoPoint,Time sunTime),SunRiseSet.getSunSet(GeoPoint geoPoint,Time sunTime)算出的是北京时间下各地区日出日落时间表，计算当地时间的话，把时区8改为Zone(glong)即可。GeoPoint类是地理位置坐标点类，构造器输入是经纬度。
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