using System;

​

public class Program

{

    public struct Vector3

    {

        public float x;

        public float y;

        public float z;

    }

​

    public static void Main()

    {

        double latitude_rad = 0;

        double longitude_rad = 0;

        double radiusEarth = 100;

        Vector3 markerPos;

        double zPos = radiusEarth * Math.Cos(latitude_rad) * Math.Cos(longitude_rad);

        double xPos = -radiusEarth * Math.Cos(latitude_rad) * Math.Sin(longitude_rad);

        double yPos = radiusEarth * Math.Sin(latitude_rad);

        markerPos.x = (float)xPos;

        markerPos.y = (float)yPos;

        markerPos.z = (float)zPos;

        Console.WriteLine(markerPos.x);

        Console.WriteLine(markerPos.y);

        Console.WriteLine(markerPos.z);

    }

}