double_star.md

Double star

Introduction

This method works out the position of a binary star around it's origin.

Function prototype

The function prototype of this function is:

double* double_star(int year,
      int month,
      int day,
      int hour,
      int min,
      double secs,
      double time_offset,
      double period,
      double periastron,
      double semi_major,
      double e,
      double i,
      double w,
      double pa);

The parameters:

The function of the parameters is:

Parameter	Purpose
year	The year of the user.
month	The month of the user.
day	The day of the user.
hour	The hour of the user.
min	The minute of the user.
secs	The seconds of the user.
time_offset	The time offset of the user from UT.
period	The period of the binary star (mean solar years).
periastron	Epoch of periastron.
semi_major	Semi-major axis of orbit (arcsec).
e	Eccentricity.
i	Inclination or orbit (degrees).
w	Longitude of periastron (degrees).
pa	Position angle of ascending node (degrees).

The output:

The output is a pointer to an array of two doubles.
The value of each element in the array is:

Element	Value held
0	Angle from north (degrees).
1	Distance from the central star (arc seconds).

Example code

The example is example-001.cpp.

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