23 refactoring pt 2 and added other daily sun events

[davideilmito]

• Added Nautical sunrise and sunset
• Added astronomical sunrise and sunset

[seldon1000]

How do you handle astronomical/civic... data?

[davideilmito]

The following variables have been introduced inside Sun object:

//Date at which there is the Nautical Sunrise
public private(set) var nauticalSunrise: Date = Date()
//Date at which there is the Nautical Sunset
public private(set) var nauticalSunset: Date = Date()
   
//Date at which there is the Astronomical Sunrise
public private(set) var astronomicalSunrise: Date = Date()
//Date at which there is the Astronomical Sunset
public private(set) var astronomicalSunset: Date = Date()