package?com.sven.calendar.utils;

import?android.content.Context;

import?com.sven.calendar.R;

import?java.util.Calendar;

/**
?*?@author?lxslove
?*?@mail?moodlxs@163.com
?*?
?*?@see?http://www.doc88.com/p-211656359926.html?原理，http://www.fjptsz.com/xxjs/xjw/rj/115.htm?web版
?*/
public?class?SolarTerm?{
	//?========角度變換===============
	private?static?final?double?rad?=?180?*?3600?/?Math.PI;?//?每弧度的角秒數
	private?static?final?double?RAD?=?180?/?Math.PI;?//?每弧度的角度數
	//?================日歷計算===============
	private?static?final?double?J2000?=?2451545;?//?2000年前儒略日數（2000-1-1?12:00:00格林威治平時）

	//?=========黃赤交角及黃赤坐標變換===========
	private?static?final?double?hcjjB[]?=?{?84381.448?-46.8150?-0.00059
			0.001813?};//?黃赤交角系數表
	private?static?final?double?preceB[]?=?{?0?50287.92262?111.24406
			0.07699?-0.23479?-0.00178?0.00018?0.00001?};//?Date黃道上的歲差p

	private?double?Y?=?2000;
	private?double?M?=?1;
	private?double?D?=?1;
	private?double?h?=?12;
	private?double?m?=?0;
	private?double?s?=?0;

	private?static?final?double[]?dts?=?{
			//?世界時與原子時之差計算表
			-4000?108371.7?-13036.80?392.000?0.0000?-500?17201.0
			-627.82?16.170?-0.3413?-150?12200.6?-346.41?5.403?-0.1593
			150?9113.8?-328.13?-1.647?0.0377?500?5707.5?-391.41?0.915
			0.3145?900?2203.4?-283.45?13.034?-0.1778?1300?490.1?-57.35
			2.085?-0.0072?1600?120.0?-9.81?-1.532?0.1403?1700?10.2
			-0.91?0.510?-0.0370?1800?13.4?-0.72?0.202?-0.0193?1830
			7.8?-1.81?0.416?-0.0247?1860?8.3?-0.13?-0.406?0.0292?1880
			-5.4?0.32?-0.183?0.0173?1900?-2.3?2.06?0.169?-0.0135?1920
			21.2?1.69?-0.304?0.0167?1940?24.2?1.22?-0.064?0.0031?1960
			33.2?0.51?0.231?-0.0109?1980?51.0?1.29?-0.026?0.0032?2000
			64.7?-1.66?5.224?-0.2905?2150?279.4?732.95?429.579?0.0158
			6000?};

	//?取整數部分
	public?static?double?int2（double?v）?{
		v?=?Math.floor（v）;
		if?（v?			return?v?+?1;

		return?v;
	}

	//?對超過0-2PI的角度轉為0-2PI
	public?static?double?rad2mrad（double?v）?{
		v?=?v?%?（2?*?Math.PI）;
		if?（v?			return?v?+?2?*?Math.PI;

		return?v;
	}

	//?計算世界時與原子時之差傳入年
	public?double?deltatT（double?y）?{
		int?i?=?0;
		for?（i?=?0;?i?			if?（y?				break;

		double?t1?=?（y?-?dts[i]）?/?（dts[i?+?5]?-?dts[i]）?*?10;
		double?t2?=?t1?*?t1;
		double?t3?=?t2?*?t1;
		return?dts[i?+?1]?+?dts[i?+?2]?*?t1?+?dts[i?+?3]?*?t2?+?dts[i?+?4]?*?t3;
	}

	//?傳入儒略日（J2000起算）計算UTC與原子時的差（單位:日）
	public?double?deltatT2（double?jd）?{
		return?this.deltatT（jd?/?365.2425?+?2000）?/?86400.0;
	}

	//?公歷轉儒略日UTC=1表示原日期是UTC
	public?double?toJD（boolean?UTC）?{
		double?y?=?this.Y;?//?取出年月
		double?m?=?this.M;
		double?n?=?0;

		if?（m?<=?2）?{
			m?+=?12;
			y--;
		}

		if?（this.Y?*?372?+?this.M?*?31?+?this.D?>=?588829）?{
			//?判斷是否為格里高利歷日1582*372+10*31+15
			n?=?int2（y?/?100）;
			n?=?2?-?n?+?int2（n?/?4）;//?加百年閏
		}

		n?+=?int2（365.2500001?*?（y?+?4716））;?//?加上年引起的偏移日數
		n?+=?int2（30.6?*?（m?+?1））?+?this.D;?//?加上月引起的偏移日數及日偏移數
		n?+=?（（t

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件???????50340??2014-03-24?09:06??精確計算農歷二十四節氣\SolarTerm.java
?????目錄???????????0??2018-12-11?17:53??精確計算農歷二十四節氣\