Astro Namespace Reference

Astronomical coordinate systems and coordinate conversions, time and data functions. More...

Classes

• class Star

  Compact information about a star in the sky. More...
  

• struct CelestialSphere

  Documentation for class CelestialSphere. More...
  

• class coord

  Base class for various spherical coordinate systems. More...
  

• struct geo_ecliptic

  Geoecliptic coordinates (celestial). More...
  

• struct helio_ecliptic

  Helioecliptic coordinates (celestial). More...
  

• struct radec

  Rectascension/declination coordinates (celestial). More...
  

• struct hadec

  Hour angle/declination coordinates (celestial). More...
  

• class altazimuth

  Altazimuth coordinates (celestial). More...
  

• struct galactic

  Galactic coordinates (celestial). More...
  

• struct geodesic

  Geodesic coordinates (geophysical). More...
  

• struct geocentric

  Geocentric coordinates (geophysical). More...
  

• struct geoastronomic

  Geoastronomic coordinates (geophysical). More...
  

• struct spherical

  Spherical Template for adding a radial component to spherical coordinates on a sphere. More...
  

• struct Riset

  Class for computing the rise and set of astronomical objects. More...
  

• struct Sky

  A class to handle stars in the celestial sky. More...
  

• class Time

  Relative time scale. More...
  

• class Date

  Absolute time scale. More...
  

Enumerations

• enum month

  Symbolic constants for month names.
  

Functions

• coord operator- (const coord &P, const coord &Q)
• const char * scan_coord (const char *s, double &d)

  Parse some string containing some angular unit.
  

• double deg_to_rad (register const double &degree)

  Convert degrees to radians.
  

• double rad_to_deg (register const double &radiant)

  Convert radians to degrees.
  

• double hour_to_rad (register const double &degree)

  Convert hours to radians.
  

• double rad_to_hour (register const double &degree)

  Convert radians to hours.
  

• double hour_to_deg (register const double &radiant)

  Convert hours to degrees.
  

• double deg_to_hour (register const double &radiant)

  Convert degrees to hours.
  

• double arcmin (register const double arcmins)

  Convert arc minutes to radians.
  

• double arcsec (register const double arcsecs)

  Convert arc seconds to radians.
  

• int Timezone (const geoastronomic &Ort, bool dl=false)

  Timezone of the given place (w/o daylight correction).
  

• Date GMT_TZ (const Date &TZ, const geoastronomic &wo, bool dl=false)

  Greenwhichtime for Zonetime "TZ" at some place.
  

• Date LT_TZ (const Date &GT, const geoastronomic &wo, bool dl=false)

  Locale Zonetime at Greenwhichtime GT at some place.
  

• Date scandate (const char *c)

  compute date from string
  

• Time scantime (const char *c)

  compute time from string
  

• month scan_month (const char *mname)

  Get symbolic month constant from given textual string.
  

• Time GST (const Date &datum)

  Greenwhich Mean Sidereal Time.
  

• Date now ()

  Current date and time, from system clock.
  

Variables

• const double sidrate = 0.9972695677

  Ratio of synodic (solar) to sidereal (stellar) rate.
  

• lang Months [14]

  Month names, indices start with 1.
  

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Function Documentation

coord Astro::operator-	(	const coord &	P,
		const coord &	Q
	)

Uses

• 3x sin, 3x cos
• 2x atan2
• 1x sqrt
• 9 multiplications
• 4 additions

const char * Astro::scan_coord	(	const char *	s,
		double &	d
	)

Possible known formats are:

1. as radians: eg. 1.23
2. as degrees: eg 60.12°
3. as deg,min,sec: eg. 60°12'13.8"
4. as hour format: eg. 4.23h
5. as hours,min,sec: eg. 4h10m30s

Returns:

Pointer to the position of the string where parsing was terminated.