morningAstronomicalTwilight property

Twilight morningAstronomicalTwilight

The morning 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 no longer visible to the naked eye under good conditions.

Implementation

Twilight get morningAstronomicalTwilight =>
    _morningAstronomicalTwilight ??= Twilight(
      SunriseSunsetCalculator(instant, latitude, longitude,
              sunZenithDistance: 108.0)
          .calculateSunrise(),
      SunriseSunsetCalculator(instant, latitude, longitude,
              sunZenithDistance: 102.0)
          .calculateSunrise(),
    );