sun.c
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	#include <stdio.h>
	#include <math.h>

	int months[]={0, 31, 28, 31, 30, 31, 30,
	31, 31, 30, 31, 30, 31};
	char weekdays[7][15]={"Sunday", "Monday", "Tuesday", "Wednesday",
	"Thursday", "Friday", "Saturday"};

	/* this program calculates the latidude
	where polar day begins/ends */
	void main()
	{
	int day=24, month=6, weekday=2;
	double angle=0;
	double latitude;

	do
	{
	latitude=atan(tan((23+27.0/60)M_PI/180)cos(angle))*180/M_PI;
	latitude=(latitude>0)? 90-latitude : -90-latitude;
	printf("%2d.%02d %12s : %d %02d'\n", day, month,
	weekdays[weekday], (int)latitude,
	(int)fabs((latitude-(int)latitude)*60));
	if (weekday==0)
	printf("\n");

	angle+=2*M_PI/365;
	day++;
	if (day>months[month])
	{
	day=1;
	month++;
	if (month>12)
	month=1;
	}
	if (++weekday>6)
	weekday=0;
	} while (month!=1);
	}