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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        
        
        private int DayNumber
        {
            get
            {
                return DateTime.Now.DayOfYear;
                //return 64;
            }
        }

private double CalculateDeclinationAngleJAVA()
        {
            return 23.45 * Math.Sin((DegreeToRadian(360.0 / 365.25)) * (DayNumber - 81));
        }

private double CalculateDeclinationAngle()
        {
           var tmp = (2 * Math.PI) * ((284 + DayNumber) / 365.25);
           return 23.45 * (Math.PI / 180.0) * Math.Sin(tmp);
        }

private double DegreeToRadian(double angle)
        {
            return Math.PI * angle / 180.0;
        }

private double RadianToDegree(double angle)
        {
            return angle * (180.0 / Math.PI);
        }
        
        public static void Main(string[] args)
        {
            Program p= new Program();
            Console.WriteLine("angle - C#   : " + p.RadianToDegree( p.CalculateDeclinationAngle()).ToString());
            Console.WriteLine("angle - JAVA : " + p.CalculateDeclinationAngleJAVA().ToString());
        }
    }
}

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Compilation time: 0.14 sec, absolute running time: 0.09 sec, cpu time: 0.08 sec, average memory usage: 14 Mb, average nr of threads: 3