java 计算日出日落时间

傷城~ 2022-10-29 01:46 391阅读 0赞

public class SunTimesUtil { 
        static Double start = 0.0;
        static Double end = 0.0;
        static Double sRA = 0.0;
        static Double sdec = 0.0;
        static Double sr = 0.0;
        static Double lon = 0.0;
    
        public static void main(String[] args) throws ParseException { 
    
            //今天
            Calendar calendar  = Calendar.getInstance();
            System.out.println(calendar.getTime());
            System.out.println(getSunTimeAtDate(calendar.getTime(),120.2722222,30.333333333 ));
        }
    
        public static HashMap<String,Object> getSunTimeAtDate(Date d,Double longitude, Double latitude){ 
            long xcts =Days_since_2000_Jan_0(d);
            HashMap<String,Object> hm = new HashMap<>(2);
            try { 
                hm =  GetSunTime(xcts,longitude, latitude);
            } catch (ParseException e) { 
                e.printStackTrace();
            }
            return hm;
        }
    
    
    
        public static HashMap<String,Object> GetSunTime(long day, Double longitude, Double latitude) throws ParseException
        { 
            SunRiset(day, longitude, latitude, -35.0 / 60.0, 1,start,end);
            String sunrise = ToLocalTime(start);
            String sunset = ToLocalTime(end);
            HashMap<String,Object> hm = new HashMap<>(2);
            hm.put("sunRise",sunrise);
            hm.put("sunSet",sunset);
            return hm;
        }
        private static String ToLocalTime(Double utTime)
        { 
            int hour = (int) (Math.floor(utTime));
            Double temp = utTime - hour;
            hour += 8;
            temp = temp * 60;
            int minute = (int) (Math.floor(temp));
            String minuteStr = minute+" ";
            if(minute<10){ 
                minuteStr = "0"+minute;
            }
            return hour+":"+minuteStr;
        }
    
        private static void Sunpos(Double d, Double lon, Double r)
        { 
            Double M,//太阳的平均近点角，从太阳观察到的地球（=从地球看到太阳的）距近日点（近地点）的角度。
                    w, //近日点的平均黄道经度。
                    e, //地球椭圆公转轨道离心率。
                    E, //太阳的偏近点角。计算公式见下面。
    
                    x, y,
                    v;  //真近点角，太阳在任意时刻的真实近点角。
    
    
            M = Revolution(356.0470 + 0.9856002585 * d);//自变量的组成：2000.0时刻太阳黄经为356.0470度,此后每天约推进一度（360度/365天
            w = 282.9404 + 4.70935E-5 * d;//近日点的平均黄经。
    
            e = 0.016709 - 1.151E-9 * d;//地球公转椭圆轨道离心率的时间演化。以上公式和黄赤交角公式一样，不必深究。
    
            E = M + e * Radge * Sind(M) * (1.0 + e * Cosd(M));
            x = Cosd(E) - e;
            y = Math.sqrt(1.0 - e * e) * Sind(E);
            setSr(Math.sqrt(x * x + y * y));
            v = Atan2d(y, x);
            lon = v + w;
            setLon(lon);
            if (lon >= 360.0)
            { lon -= 360.0;
                setLon(lon);}
        }
    
        private static void Sun_RA_dec(Double d,  Double RA,  Double dec, Double r)
        { 
            Double obl_ecl, x, y, z;
            Sunpos(d, lon, r);
            //计算太阳的黄道坐标。
            x = sr * Cosd(lon);
            y = sr * Sind(lon);
            //计算太阳的直角坐标。
            obl_ecl = 23.4393 - 3.563E-7 * d;
            //黄赤交角，同前。
            z = y * Sind(obl_ecl);
            y = y * Cosd(obl_ecl);
            //把太阳的黄道坐标转换成赤道坐标（暂改用直角坐标）。
    
            setsRA(Atan2d(y, x));
            setSdec(Atan2d(z, Math.sqrt(x * x + y * y)));
            //最后转成赤道坐标。显然太阳的位置是由黄道坐标方便地直接确定的，但必须转换到赤
            //道坐标里才能结合地球的自转确定我们需要的白昼长度。
    
        }
        private static int SunRiset(long day, Double longitude, Double lat, Double altit, int upper_limb, Double trise, Double tset)
        { 
            Double d,  /* Days since 2000 Jan 0.0 (negative before) */
                    //以历元2000.0起算的日数。
    
                    sradius,    /* Sun's apparent radius */
                    //太阳视半径，约16分（受日地距离、大气折射等诸多影响）
    
                    t,          /* Diurnal arc */
                    //周日弧，太阳一天在天上走过的弧长。
    
                    tsouth,     /* Time when Sun is at south */
                    sidtime;    /* Local sidereal time */
            //当地恒星时，即地球的真实自转周期。比平均太阳日（日常时间）长3分56秒。
    
            int rc = 0; /* Return cde from function - usually 0 */
    
                /* Compute d of 12h local mean solar time */
            d = day/* Days_since_2000_Jan_0(date)*/ + 0.5 - longitude / 360.0;
            //计算观测地当日中午时刻对应2000.0起算的日数。
    
                /* Compute local sideral time of this moment */
            sidtime = Revolution(GMST0(d) + 180.0 + longitude);
            //计算同时刻的当地恒星时（以角度为单位）。以格林尼治为基准，用经度差校正。
    
                /* Compute Sun's RA + Decl at this moment */
            Sun_RA_dec(d, sRA,sdec,sr);
            //计算同时刻太阳赤经赤纬。
    
                /* Compute time when Sun is at south - in hours UT */
            tsouth = 12.0 - Rev180(sidtime - sRA) / 15.0;
            //计算太阳日的正午时刻，以世界时（格林尼治平太阳时）的小时计。
    
                /* Compute the Sun's apparent radius, degrees */
            sradius = 0.2666 / sr;
            //太阳视半径。0.2666是一天文单位处的太阳视半径（角度）。
    
                /* Do correction to upper limb, if necessary */
            if (upper_limb != 0)
                altit -= sradius;
            //如果要用上边缘，就要扣除一个视半径。
    
                /* Compute the diurnal arc that the Sun traverses to reach */
            //计算周日弧。直接利用球面三角公式。如果碰到极昼极夜问题，同前处理。
                /* the specified altitide altit: */
    
            Double cost;
            cost = (Sind(altit) - Sind(lat) * Sind(sdec)) /
                    (Cosd(lat) * Cosd(sdec));
            if (cost >= 1.0)
            { 
                rc = -1;
                t = 0.0;
            }
            else
            { 
                if (cost <= -1.0)
                { 
                    rc = +1;
                    t = 12.0;      /* Sun always above altit */
                }
                else
                    t = Acosd(cost) / 15.0;   /* The diurnal arc, hours */
            }
    
                /* Store rise and set times - in hours UT */
            setStart(tsouth - t);
            setEnd(tsouth + t);
            return rc;
        }
        private static long Days_since_2000_Jan_0(Date date)
        { 
            String d2000 = "2000-01-01";
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Long ll = 0L;
            try { 
                ll = date.getTime()-sdf.parse(d2000).getTime();
            } catch (ParseException e) { 
                e.printStackTrace();
            }
            long day = ll/1000/60/60/24;
            return day;
        }
    
        private static Double Revolution(Double x)
        { 
            return (x - 360.0 * Math.floor(x * Inv360));
        }
    
        private static Double Rev180(Double x)
        { 
            return (x - 360.0 * Math.floor(x * Inv360 + 0.5));
        }
    
        private static Double GMST0(Double d)
        { 
            Double sidtim0;
            sidtim0 = Revolution((180.0 + 356.0470 + 282.9404) +
                    (0.9856002585 + 4.70935E-5) * d);
            return sidtim0;
        }
    
    
        private static Double Inv360 = 1.0 / 360.0;
        private static Double Sind(Double x)
        { 
            return Math.sin(x * Degrad);
        }
    
        private static Double Cosd(Double x)
        { 
            return Math.cos(x * Degrad);
        }
    
          /* private static Double Tand(Double x) { return Math.tan(x * Degrad); } private static Double Atand(Double x) { return Radge * Math.atan(x); } private static Double Asind(Double x) { return Radge * Math.asin(x); }*/
    
        private static Double Acosd(Double x)
        { 
            return Radge * Math.acos(x);
        }
    
        private static Double Atan2d(Double y, Double x)
        { 
            return Radge * Math.atan2(y, x);
    
        }
    
        private static Double Radge = 180.0 / Math.PI;
        private static Double Degrad = Math.PI / 180.0;
    
        public static Double getStart() { 
            return start;
        }
    
        public static void setStart(Double start) { 
            SunTimesUtil.start = start;
        }
    
        public static Double getsRA() { 
            return sRA;
        }
    
        public static void setsRA(Double sRA) { 
            SunTimesUtil.sRA = sRA;
        }
    
        public static Double getSdec() { 
            return sdec;
        }
    
        public static void setSdec(Double sdec) { 
            SunTimesUtil.sdec = sdec;
        }
    
        public static Double getSr() { 
            return sr;
        }
    
        public static void setSr(Double sr) { 
            SunTimesUtil.sr = sr;
        }
    
        public static Double getLon() { 
            return lon;
        }
    
        public static void setLon(Double lon) { 
            SunTimesUtil.lon = lon;
        }
    
        public static Double getEnd() { 
            return end;
        }
    
        public static void setEnd(Double end) { 
            SunTimesUtil.end = end;
        }
    
    }