eveningAstronomicalTwilight property

Twilight eveningAstronomicalTwilight

The evening astronomical twilight.

The astronomical twilight is when the centre of the Sun is between 12° and 18° below the sensible horizon. Astronomical twilight is often considered to be "complete darkness". Sixth magnitude stars are now visible to the naked eye under good conditions.

Implementation

Twilight get eveningAstronomicalTwilight =>
    _eveningAstronomicalTwilight ??= Twilight(
      SunriseSunsetCalculator(instant, latitude, longitude,
              sunZenithDistance: 102.0)
          .calculateSunset(),
      SunriseSunsetCalculator(instant, latitude, longitude,
              sunZenithDistance: 108.0)
          .calculateSunset(),
    );