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Полумрак

Залезът е времето между залеза и нощта, както и между нощта и изгрева, когато слънцето е под хоризонта, но атмосферата е осветена от слънцето. Този ефект на осветяване е резултат от излъчването на слънчевата светлина от горната атмосфера.
Има три вида здрач, определени от това докъде е слънцето под хоризонта:

  • навигационен здрач
  • морски здрач
  • астрономически здрач.

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