path: root/libtellurian_normal_gravity.c

/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST


double
libtellurian_normal_gravity(double latitude)
{
	latitude = radians(latitude);
	return libtellurian_normal_gravity_radians(latitude);
}


#else


static int
approx(double a, double b)
{
	return fabs(a - b) <= 1e-8 * (0.5 * (a + b));
}

int
main(void)
{
	ASSERT(libtellurian_normal_gravity(0) == libtellurian_normal_gravity_radians(0));
	ASSERT(libtellurian_normal_gravity(180) == libtellurian_normal_gravity_radians(0));
	ASSERT(libtellurian_normal_gravity(360) == libtellurian_normal_gravity_radians(0));
	ASSERT(approx(libtellurian_normal_gravity(90), libtellurian_normal_gravity(-90)));
	ASSERT(approx(libtellurian_normal_gravity(90), libtellurian_normal_gravity(270)));
	ASSERT(approx(libtellurian_normal_gravity(45), libtellurian_normal_gravity(-45)));
	ASSERT(approx(libtellurian_normal_gravity(135), libtellurian_normal_gravity(45)));
	ASSERT(approx(libtellurian_normal_gravity(-135), libtellurian_normal_gravity(135)));
	ASSERT(libtellurian_normal_gravity(90) == libtellurian_normal_gravity_radians(D90));
	ASSERT(libtellurian_normal_gravity(45) == libtellurian_normal_gravity_radians(D45));
	ASSERT(libtellurian_normal_gravity(30) == libtellurian_normal_gravity_radians(D30));
	return 0;
}


#endif