Celestia: astro::Date Class Reference

Constructor & Destructor Documentation

astro::Date::Date

(

)

Definition at line 325 of file astro.cpp.

References day, hour, minute, month, seconds, and year.

00326 {
00327     year = 0;
00328     month = 0;
00329     day = 0;
00330     hour = 0;
00331     minute = 0;
00332     seconds = 0.0;
00333 }

astro::Date::Date	(	int	Y,
		int	M,
		int	D
	)

Definition at line 335 of file astro.cpp.

References day, hour, minute, month, seconds, and year.

00336 {
00337     year = Y;
00338     month = M;
00339     day = D;
00340     hour = 0;
00341     minute = 0;
00342     seconds = 0.0;
00343 }

astro::Date::Date

(

double

)

Definition at line 346 of file astro.cpp.

References day, hour, minute, month, seconds, and year.

00347 {
00348     int a = (int) (jd + 0.5);
00349     double c;
00350     if (a < 2299161)
00351     {
00352         c = a + 1524;
00353     }
00354     else
00355     {
00356         double b = (int) ((a - 1867216.25) / 36524.25);
00357         c = a + b - (int) (b / 4) + 1525;
00358     }
00359 
00360     int d = (int) ((c - 122.1) / 365.25);
00361     int e = (int) (365.25 * d);
00362     int f = (int) ((c - e) / 30.6001);
00363 
00364     double dday = c - e - (int) (30.6001 * f) + ((jd + 0.5) - (int) (jd + 0.5));
00365 
00366     /* This following used to be 14.0, but gcc was computing it incorrectly, so
00367        it was changed to 14 */
00368     month = f - 1 - 12 * (int) (f / 14);
00369     year = d - 4715 - (int) ((7.0 + month) / 10.0);
00370     day = (int) dday;
00371     
00372     double dhour = (dday - day) * 24;
00373     hour = (int) dhour;
00374 
00375     double dminute = (dhour - hour) * 60;
00376     minute = (int) dminute;
00377 
00378     seconds = (dminute - minute) * 60;
00379 }

Member Function Documentation

astro::Date::operator double

(

)

const

Definition at line 383 of file astro.cpp.

References B, day, hour, minute, month, seconds, and year.

00384 {
00385     int y = year, m = month;
00386     if (month <= 2)
00387     {
00388         y = year - 1;
00389         m = month + 12;
00390     }
00391 
00392     // Correct for the lost days in Oct 1582 when the Gregorian calendar
00393     // replaced the Julian calendar.
00394     int B = -2;
00395     if (year > 1582 || (year == 1582 && (month > 10 || (month == 10 && day >= 15))))
00396     {
00397         B = y / 400 - y / 100;
00398     }
00399 
00400     return (floor(365.25 * y) +
00401             floor(30.6001 * (m + 1)) + B + 1720996.5 +
00402             day + hour / 24.0 + minute / 1440.0 + seconds / 86400.0);
00403 }

astro::Date Class Reference

Public Member Functions

Public Attributes

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation


Public Member Functions
	Date (double)
	Date (int Y, int M, int D)
	Date ()
	operator double () const
Public Attributes
int	day
int	hour
int	minute
int	month
double	seconds
int	year