public static void Main()
Console.WriteLine("Hello! A leap year is something that occurs every four years, in which an extra day, Feburary 29th, is added.");
Console.WriteLine("This happens in order to synchronize the calendars created by humans, with the Earth's orbit around the sun, which takes 365.25 days.");
Console.WriteLine("The problem is that during common years, the extra .25 days which are needed for Earth to complete a full orbit, are not added.");
Console.WriteLine("So because of this, the human calendar is faster than the solar year, which would end up creating a drift, ");
Console.WriteLine("in wich the calendar year would be off by about one day after four years.");
Console.WriteLine("Enter a year to find out if it is a leap year, or a common year.");
string input = Console.ReadLine();
if (uint.TryParse(input, out year))
Console.WriteLine("Please enter a higher year. This is because in 1582, the current calendar, the Gregorian calendar, was first put into place.");
Console.WriteLine("Don't think so far into the future.");
if (year >= 1582 && year <= 3000)
Console.WriteLine(year + " is a commmon year.");
else if (year % 100 != 0)
Console.WriteLine(year + " is a leap year.");
else if (year % 400 != 0)
Console.WriteLine(year + " is a common year.");
Console.WriteLine(year + " is a leap year.");
Console.WriteLine("Please enter a positive integer.");