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delta_t.cpp
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delta_t.cpp
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#include "delta_t.hpp"
namespace conv_time {
/*
* @brief ΔT (year < -500)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_m500(double y) {
double t;
double dlt_t;
try {
t = (y - 1820) / 100.0;
dlt_t = -20 + 32 * t * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (-500 <= year && year < 500)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_0500(double y) {
double t;
double dlt_t;
try {
t = y / 100.0;
dlt_t = 10583.6 +
(-1014.41 +
( 33.78311 +
( -5.952053 +
( -0.1798452 +
( 0.022174192 +
( 0.0090316521)
* t) * t) * t) * t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT ( 500 <= year && year < 1600)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_1600(double y) {
double t;
double dlt_t;
try {
t = (y - 1000) / 100.0;
dlt_t = 1574.2 +
(-556.01 +
( 71.23472 +
( 0.319781 +
( -0.8503463 +
( -0.005050998 +
( 0.0083572073)
* t) * t) * t) * t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (1600 <= year && year < 1700)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_1700(double y) {
double t;
double dlt_t;
try {
t = y - 1600;
dlt_t = 120 +
( -0.9808 +
( -0.01532 +
( 1.0 / 7129.0)
* t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (1700 <= year && year < 1800)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_1800(double y) {
double t;
double dlt_t;
try {
t = y - 1700;
dlt_t = 8.83 +
( 0.1603 +
(-0.0059285 +
( 0.00013336 +
(-1.0 / 1174000.0)
* t) * t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (1800 <= year && year < 1860)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_1860(double y) {
double t;
double dlt_t;
try {
t = y - 1800;
dlt_t = 13.72 +
(-0.332447 +
( 0.0068612 +
( 0.0041116 +
(-0.00037436 +
( 0.0000121272 +
(-0.0000001699 +
( 0.000000000875)
* t) * t) * t) * t) * t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (1860 <= year && year < 1900)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_1900(double y) {
double t;
double dlt_t;
try {
t = y - 1860;
dlt_t = 7.62 +
( 0.5737 +
(-0.251754 +
( 0.01680668 +
(-0.0004473624 +
( 1.0 / 233174.0)
* t) * t) * t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (1900 <= year && year < 1920)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_1920(double y) {
double t;
double dlt_t;
try {
t = y - 1900;
dlt_t = -2.79 +
( 1.494119 +
(-0.0598939 +
( 0.0061966 +
(-0.000197 )
* t) * t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (1920 <= year && year < 1941)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_1941(double y) {
double t;
double dlt_t;
try {
t = y - 1920;
dlt_t = 21.20 +
( 0.84493 +
(-0.076100 +
( 0.0020936)
* t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (1941 <= year && year < 1961)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_1961(double y) {
double t;
double dlt_t;
try {
t = y - 1950;
dlt_t = 29.07 +
( 0.407 +
(-1 / 233.0 +
( 1 / 2547.0)
* t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (1961 <= year && year < 1986)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_1986(double y) {
double t;
double dlt_t;
try {
t = y - 1975;
dlt_t = 45.45 +
( 1.067 +
(-1 / 260.0 +
(-1 / 718.0)
* t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (1986 <= year && year < 2005)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_2005(double y) {
double t;
double dlt_t;
try {
t = y - 2000;
dlt_t = 63.86 +
( 0.3345 +
(-0.060374 +
( 0.0017275 +
( 0.000651814 +
( 0.00002373599)
* t) * t) * t) * t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (2005 <= year && year < 2050)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_bf_2050(double y) {
double t;
double dlt_t;
try {
t = y - 2000;
dlt_t = 62.92 +
( 0.32217 +
( 0.005589)
* t) * t;
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (2050 <= year && year <= 2150)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_to_2150(double y) {
double t;
double dlt_t;
try {
t = (y - 1820) / 100.0;
dlt_t = -20
+ 32 * t * t
- 0.5628 * (2150 - y);
} catch (...) {
throw;
}
return dlt_t;
}
/*
* @brief ΔT (2150 < year)
*
* @param[in] 計算用西暦年 (int)
* @return ΔT (double)
*/
double calc_dlt_t_af_2150(double y) {
double t;
double dlt_t;
try {
t = (y - 1820) / 100.0;
dlt_t = -20 + 32 * t * t;
} catch (...) {
throw;
}
return dlt_t;
}
} // namespace conv_time