/**
* 节气计算类
*/
public final class SolarTerm {
// 提供定位的年份
private static final int baseYear = 1901;
/**
* 计算公历年当月的中气，公历月从0起始！
* @param y 年
* @param m 月
* @return 中气日期
*/
public static int principleTerm(int y, int m) {
m++;
if (y < baseYear || y > 2100) {
return 0;
}
int index = 0;
int ry = y - baseYear + 1;
while (ry >= principleTermYear[m - 1][index]) {
index++;
}
int term = principleTermMap[m - 1][4 * index + ry % 4];
if ((ry == 171) && (m == 3)) {
term = 21;
}
if ((ry == 181) && (m == 5)) {
term = 21;
}
return term;
}
/**
* 计算公历年当月的节气，公历月从0起始！
* @param y 年
* @param m 月
* @return 每月节气日期
*/
public static int sectionalTerm(int y, int m) {
m++;
if (y < baseYear || y > 2100) {
return 0;
}
int index = 0;
int ry = y - baseYear + 1;
while (ry >= sectionalTermYear[m - 1][index]) {
index++;
}
int term = sectionalTermMap[m - 1][4 * index + ry % 4];
if ((ry == 121) && (m == 4)) {
term = 5;
}
if ((ry == 132) && (m == 4)) {
term = 5;
}
if ((ry == 194) && (m == 6)) {
term = 6;
}
return term;
}
/**
* 获取指定月份的节气名称 每月就一个节气
* @param m 月份，符合Calendar中月份定义，从0算起
* @return 该月节气的名称
*/
public static String getPrincipleTermName(int m)
{
if (m < 0 || m >= principleTermNames.length){
return "";
}
return principleTermNames[m];
}
/**
* 获取指定月份中气名称 每月就一个中气
* @param m 月份，符合Calendar中月份定义，从0算起
* @return 该月中气名称
*/
public static String getSectionalTermName(int m)
{
if (m < 0 || m >= sectionalTermNames.length){
return "";
}
return sectionalTermNames[m];
}
// 每月节气名称集合
private static final String[] principleTermNames = { "大寒", "雨水", "春分",
"谷雨", "夏满", "夏至", "大暑", "处暑", "秋分", "霜降", "小雪", "冬至" };
// 每月中气名称集合
private static final String[] sectionalTermNames = { "小寒", "立春", "惊蛰",
"清明", "立夏", "芒种", "小暑", "立秋", "白露", "寒露", "立冬", "大雪" };
// 节气映射表
private static final char[][] sectionalTermMap = {
{ 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 6, 6, 6, 5, 5, 6, 6, 5, 5, 5, 5, 5,
5, 5, 5, 4, 5, 5 },
{ 5, 4, 5, 5, 5, 4, 4, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 4, 4, 4, 3,
3, 4, 4, 3, 3, 3 },
{ 6, 6, 6, 7, 6, 6, 6, 6, 5, 6, 6, 6, 5, 5, 6, 6, 5, 5, 5, 6, 5, 5,
5, 5, 4, 5, 5, 5, 5 },
{ 5, 5, 6, 6, 5, 5, 5, 6, 5, 5, 5, 5, 4, 5, 5, 5, 4, 4, 5, 5, 4, 4,
4, 5, 4, 4, 4, 4, 5 },
{ 6, 6, 6, 7, 6, 6, 6, 6, 5, 6, 6, 6, 5, 5, 6, 6, 5, 5, 5, 6, 5, 5,
5, 5, 4, 5, 5, 5, 5 },
{ 6, 6, 7, 7, 6, 6, 6, 7, 6, 6, 6, 6, 5, 6, 6, 6, 5, 5, 6, 6, 5, 5,
5, 6, 5, 5, 5, 5, 4, 5, 5, 5, 5 },
{ 7, 8, 8, 8, 7, 7, 8, 8, 7, 7, 7, 8, 7, 7, 7, 7, 6, 7, 7, 7, 6, 6,
7, 7, 6, 6, 6, 7, 7 },
{ 8, 8, 8, 9, 8, 8, 8, 8, 7, 8, 8, 8, 7, 7, 8, 8, 7, 7, 7, 8, 7, 7,
7, 7, 6, 7, 7, 7, 6, 6, 7, 7, 7 },
{ 8, 8, 8, 9, 8, 8, 8, 8, 7, 8, 8, 8, 7, 7, 8, 8, 7, 7, 7, 8, 7, 7,
7, 7, 6, 7, 7, 7, 7 },
{ 9, 9, 9, 9, 8, 9, 9, 9, 8, 8, 9, 9, 8, 8, 8, 9, 8, 8, 8, 8, 7, 8,
8, 8, 7, 7, 8, 8, 8 },
{ 8, 8, 8, 8, 7, 8, 8, 8, 7, 7, 8, 8, 7, 7, 7, 8, 7, 7, 7, 7, 6, 7,
7, 7, 6, 6, 7, 7, 7 },
{ 7, 8, 8, 8, 7, 7, 8, 8, 7, 7, 7, 8, 7, 7, 7, 7, 6, 7, 7, 7, 6, 6,
7, 7, 6, 6, 6, 7, 7 } };
private static final char[][] sectionalTermYear = {
{ 13, 49, 85, 117, 149, 185, 201, 250, 250 },
{ 13, 45, 81, 117, 149, 185, 201, 250, 250 },
{ 13, 48, 84, 112, 148, 184, 200, 201, 250 },
{ 13, 45, 76, 108, 140, 172, 200, 201, 250 },
{ 13, 44, 72, 104, 132, 168, 200, 201, 250 },
{ 5, 33, 68, 96, 124, 152, 188, 200, 201 },
{ 29, 57, 85, 120, 148, 176, 200, 201, 250 },
{ 13, 48, 76, 104, 132, 168, 196, 200, 201 },
{ 25, 60, 88, 120, 148, 184, 200, 201, 250 },
{ 16, 44, 76, 108, 144, 172, 200, 201, 250 },
{ 28, 60, 92, 124, 160, 192, 200, 201, 250 },
{ 17, 53, 85, 124, 156, 188, 200, 201, 250 } };
private static final char[][] principleTermMap = {
{ 21, 21, 21, 21, 21, 20, 21, 21, 21, 20, 20, 21, 21, 20, 20, 20,
20, 20, 20, 20, 20, 19, 20, 20, 20, 19, 19, 20 },
{ 20, 19, 19, 20, 20, 19, 19, 19, 19, 19, 19, 19, 19, 18, 19, 19,
19, 18, 18, 19, 19, 18, 18, 18, 18, 18, 18, 18 },
{ 21, 21, 21, 22, 21, 21, 21, 21, 20, 21, 21, 21, 20, 20, 21, 21,
20, 20, 20, 21, 20, 20, 20, 20, 19, 20, 20, 20, 20 },
{ 20, 21, 21, 21, 20, 20, 21, 21, 20, 20, 20, 21, 20, 20, 20, 20,
19, 20, 20, 20, 19, 19, 20, 20, 19, 19, 19, 20, 20 },
{ 21, 22, 22, 22, 21, 21, 22, 22, 21, 21, 21, 22, 21, 21, 21, 21,
20, 21, 21, 21, 20, 20, 21, 21, 20, 20, 20, 21, 21 },
{ 22, 22, 22, 22, 21, 22, 22, 22, 21, 21, 22, 22, 21, 21, 21, 22,
21, 21, 21, 21, 20, 21, 21, 21, 20, 20, 21, 21, 21 },
{ 23, 23, 24, 24, 23, 23, 23, 24, 23, 23, 23, 23, 22, 23, 23, 23,
22, 22, 23, 23, 22, 22, 22, 23, 22, 22, 22, 22, 23 },
{ 23, 24, 24, 24, 23, 23, 24, 24, 23, 23, 23, 24, 23, 23, 23, 23,
22, 23, 23, 23, 22, 22, 23, 23, 22, 22, 22, 23, 23 },
{ 23, 24, 24, 24, 23, 23, 24, 24, 23, 23, 23, 24, 23, 23, 23, 23,
22, 23, 23, 23, 22, 22, 23, 23, 22, 22, 22, 23, 23 },
{ 24, 24, 24, 24, 23, 24, 24, 24, 23, 23, 24, 24, 23, 23, 23, 24,
23, 23, 23, 23, 22, 23, 23, 23, 22, 22, 23, 23, 23 },
{ 23, 23, 23, 23, 22, 23, 23, 23, 22, 22, 23, 23, 22, 22, 22, 23,
22, 22, 22, 22, 21, 22, 22, 22, 21, 21, 22, 22, 22 },
{ 22, 22, 23, 23, 22, 22, 22, 23, 22, 22, 22, 22, 21, 22, 22, 22,
21, 21, 22, 22, 21, 21, 21, 22, 21, 21, 21, 21, 22 } };
private static final char[][] principleTermYear = {
{ 13, 45, 81, 113, 149, 185, 201 },
{ 21, 57, 93, 125, 161, 193, 201 },
{ 21, 56, 88, 120, 152, 188, 200, 201 },
{ 21, 49, 81, 116, 144, 176, 200, 201 },
{ 17, 49, 77, 112, 140, 168, 200, 201 },
{ 28, 60, 88, 116, 148, 180, 200, 201 },
{ 25, 53, 84, 112, 144, 172, 200, 201 },
{ 29, 57, 89, 120, 148, 180, 200, 201 },
{ 17, 45, 73, 108, 140, 168, 200, 201 },
{ 28, 60, 92, 124, 160, 192, 200, 201 },
{ 16, 44, 80, 112, 148, 180, 200, 201 },
{ 17, 53, 88, 120, 156, 188, 200, 201 } };
}
Created
December 18, 2018 01:51
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