During which twilight is the center of the sun 6 degrees below the horizon?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

During which twilight is the center of the sun 6 degrees below the horizon?

Explanation:
Twilight is defined by how far the Sun’s center is below the horizon. Civil twilight occurs when the Sun is 0° to 6° below the horizon, providing enough light for typical outdoor activities. The moment when the Sun’s center is 6° below the horizon marks the boundary between civil and nautical twilight, and in this convention that boundary is treated as still within civil twilight. Nautical twilight covers roughly 6° to 12° below, and astronomical twilight 12° to 18° below. Golden Hour Twilight isn’t a formal navigation term tied to a specific solar depression angle. So, with the common convention used here, the Sun’s center 6° below the horizon sits at the end of civil twilight.

Twilight is defined by how far the Sun’s center is below the horizon. Civil twilight occurs when the Sun is 0° to 6° below the horizon, providing enough light for typical outdoor activities. The moment when the Sun’s center is 6° below the horizon marks the boundary between civil and nautical twilight, and in this convention that boundary is treated as still within civil twilight. Nautical twilight covers roughly 6° to 12° below, and astronomical twilight 12° to 18° below. Golden Hour Twilight isn’t a formal navigation term tied to a specific solar depression angle. So, with the common convention used here, the Sun’s center 6° below the horizon sits at the end of civil twilight.