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bin/
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doxygen.conf
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doxygen.conf
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186
src/julianday.h
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src/julianday.h
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/** @file julianday.h
|
||||
@brief Collection of algorithms related to the Julian Day
|
||||
|
||||
From "Astronomical Algorithms", Chapter 7
|
||||
*/
|
||||
|
||||
#include <stdlib.h>
|
||||
#include <stdio.h>
|
||||
#include <math.h>
|
||||
#include <string.h>
|
||||
|
||||
/** @struct
|
||||
* Represents a date
|
||||
* with decimal day
|
||||
*/
|
||||
struct Date {
|
||||
short year; /*!< Represents the year */
|
||||
short month; /*!< Represents the month */
|
||||
double day; /*!< Represents the day as a double (to consider time) */
|
||||
char monthstr[10]; /*!< The string name of the month */
|
||||
};
|
||||
|
||||
double jd(struct Date date);
|
||||
struct Date date_from_jd(double jd);
|
||||
struct Date set_month_str(struct Date *date);
|
||||
int date_diff (struct Date first, struct Date second);
|
||||
short get_week_day(struct Date date);
|
||||
// TODO refactor to Bool...
|
||||
char is_leap_year(short year);
|
||||
short unsigned get_year_day(struct Date date);
|
||||
|
||||
/**
|
||||
* @fn
|
||||
* Calculates Julian Day from calendar date
|
||||
* @param date The Date struct to convert to JD
|
||||
* @returns The Julian Day
|
||||
*/
|
||||
double jd(struct Date date) {
|
||||
short year = date.year;
|
||||
short month = date.month;
|
||||
double day = date.day;
|
||||
|
||||
if (month == 1 || month == 2) {
|
||||
year = year - 1;
|
||||
month = month + 12;
|
||||
}
|
||||
|
||||
int a = trunc(year / 100.0);
|
||||
int b = 2 - a + trunc(a / 4.0);
|
||||
|
||||
// Should compare the date to
|
||||
// Gregorian reform...
|
||||
short is_jul_date =
|
||||
year < 1582 ||
|
||||
(year == 1582 && month < 10) ||
|
||||
(year == 1582 && month == 10 && day < 15);
|
||||
|
||||
if (is_jul_date) { b = 0; }
|
||||
|
||||
double jd = trunc(365.2500 * (year + 4716));
|
||||
|
||||
jd += trunc(30.6001 * (month + 1)) + day + b - 1524.5000;
|
||||
|
||||
return jd;
|
||||
}
|
||||
/**
|
||||
* @fn
|
||||
* Calculates calendar date from Julian Day
|
||||
* _**NOTE**_: not valid for negative JD values
|
||||
* @param jd The Julian Day to be converted to Date
|
||||
*/
|
||||
struct Date date_from_jd(double jd) {
|
||||
int z = trunc(jd + 0.5);
|
||||
double f = jd + 0.5 - z;
|
||||
int a = 0, b = 0, c = 0, d = 0, e = 0;
|
||||
|
||||
if (z < 2299161) a = z;
|
||||
if (z == 2299161 || z > 2299161) {
|
||||
int alpha = trunc((z - 1867216.25) / 36524.25);
|
||||
a = z + 1 + alpha - trunc(alpha / 4);
|
||||
}
|
||||
|
||||
b = a + 1524;
|
||||
c = trunc((b - 122.1) / 365.25);
|
||||
d = trunc(365.25 * c);
|
||||
e = trunc((b - d) / 30.6001);
|
||||
|
||||
double day = b - d - trunc(30.6001 * e) + f;
|
||||
short month;
|
||||
short year;
|
||||
|
||||
if (e < 14) month = e - 1;
|
||||
if (e == 14 || e == 15) month = e - 13;
|
||||
if (month > 2) year = c - 4716;
|
||||
if (month == 1 || month == 2) year = c - 4715;
|
||||
|
||||
struct Date date = {.year = year, .month = month, .day = day};
|
||||
|
||||
return date;
|
||||
}
|
||||
|
||||
struct Date set_month_str(struct Date *date) {
|
||||
char* test;
|
||||
|
||||
switch (date->month) {
|
||||
case 1 :
|
||||
test = "January";
|
||||
break;
|
||||
case 2 :
|
||||
test = "February";
|
||||
break;
|
||||
case 3 :
|
||||
test = "March";
|
||||
break;
|
||||
case 4 :
|
||||
test = "April";
|
||||
break;
|
||||
case 5 :
|
||||
test = "May";
|
||||
break;
|
||||
case 6 :
|
||||
test = "June";
|
||||
break;
|
||||
case 7 :
|
||||
test = "July";
|
||||
break;
|
||||
case 8 :
|
||||
test = "August";
|
||||
break;
|
||||
case 9 :
|
||||
test = "September";
|
||||
break;
|
||||
case 10 :
|
||||
test = "October";
|
||||
break;
|
||||
case 11 :
|
||||
test = "November";
|
||||
break;
|
||||
case 12 :
|
||||
test = "December";
|
||||
break;
|
||||
}
|
||||
|
||||
for (int c = 0; c < strlen(test); c++) {
|
||||
date->monthstr[c] = test[c];
|
||||
}
|
||||
|
||||
return *date;
|
||||
}
|
||||
/**
|
||||
* Returns the date difference in days
|
||||
*/
|
||||
int date_diff(struct Date first, struct Date second) {
|
||||
double jd_first = jd(first);
|
||||
double jd_second = jd(second);
|
||||
|
||||
return ceil(jd_second - jd_first);
|
||||
}
|
||||
/**
|
||||
* Returns the week day as a number
|
||||
*/
|
||||
short get_week_day(struct Date date) {
|
||||
// Day should be taken at Oh
|
||||
//date.day = trunc(date.day) + 0.0;
|
||||
double altered_jd = jd(date) + 1.5;
|
||||
|
||||
return (int)altered_jd % 7;
|
||||
}
|
||||
/**
|
||||
* Checks whether a given year is
|
||||
* a leap year (Gregorian only!!)
|
||||
*/
|
||||
char is_leap_year(short year) {
|
||||
return (year % 4) == 0;
|
||||
}
|
||||
/**
|
||||
* Returns the day number in the given year
|
||||
*/
|
||||
short unsigned get_year_day(struct Date date) {
|
||||
short k = is_leap_year(date.year) ? 1 : 2;
|
||||
|
||||
return trunc((275 * date.month) / 9)
|
||||
- k * trunc((date.month + 9) / 12)
|
||||
+ trunc(date.day) - 30;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user