Twilight events dedicated class

[rhannequin]

In the same way Astronoby::Events::ObservationEvents represent observation events for any body on the celestial sphere, twilight events exist but are related only to the Sun. For example, it doesn't make sense to talk about twilight related to a planet or a distant star.

In a goal of making events more centralized, twilight times are now extract from Astronoby::Sun into their own dedicated Astronoby::Events::TwilightEvents class.

The same methods are exposed. This adds natural memoization as all the times are calculated when the object initialized, which is when the Astronoby::Sun#twilight_events is called.

epoch = Astronoby::Epoch.from_time(Date.new(2024, 1, 1))
sun = Astronoby::Sun.new(epoch: epoch)
observer = Astronoby::Observer.new(
  latitude: Astronoby::Angle.from_degrees(48.8566),
  longitude: Astronoby::Angle.from_degrees(2.3522)
)
twilight_events = sun.twilight_events(observer: observer)

twilight_events.morning_astronomical_twilight_time
# => 2024-01-01 05:47:24 UTC

twilight_events.morning_nautical_twilight_time
# => 2024-01-01 06:25:41 UTC

twilight_events.morning_civil_twilight_time
# => 2024-01-01 07:05:51 UTC

twilight_events.evening_civil_twilight_time
# => 2024-01-01 16:37:37 UTC

twilight_events.evening_nautical_twilight_time
# => 2024-01-01 17:17:46 UTC

twilight_events.evening_astronomical_twilight_time
# => 2024-01-01 17:56:03 UTC