public class GreatCircle {
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public static void main(String[] args) {
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double x1 = Double.parseDouble(args[0]);
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double y1 = Double.parseDouble(args[1]);
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double x2 = Double.parseDouble(args[2]);
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double y2 = Double.parseDouble(args[3]);
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double r = 6371.0; // Earth radius
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double dx = Math.toRadians(x2 - x1) / 2.0;
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double dy = Math.toRadians(y2 - y1) / 2.0;
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double under = Math.sin(dx) * Math.sin(dx) +
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Math.cos(Math.toRadians(x1)) * Math.cos(Math.toRadians(x2))
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* Math.sin(dy) * Math.sin(dy);
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double distance = 2.0 * r * Math.asin(Math.sqrt(under));
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System.out.println(distance + " kilometers");
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}
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}
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