What happens because of augmentation?

Question 1 / 2707066636ee928f7522a1c519871

Question 1 of 2707066636ee928f7522a1c519871

Question 1 of 27070

What happens because of augmentation?

🔍 Key Concepts

• Augmentation of the Moon’s semidiameter in celestial navigation tables • How the apparent size of a body changes with its altitude above the horizon • Difference between optical illusions at the horizon and real geometric effects

💭 Think About

• Think about which choice describes a real geometric change in the body’s apparent size with altitude, not just an illusion due to background contrast. • Consider which option specifically relates to the Moon’s semidiameter values you see in nautical almanacs and how those are corrected. • Ask yourself: does augmentation mainly concern the Sun, the Moon, or both, and which option reflects that correctly?

✅ Before You Answer

• Verify which option involves a change in apparent size with increasing altitude rather than at low altitudes. • Check which choice is about the Moon’s apparent size, consistent with augmentation tables used in navigation. • Eliminate options that only describe horizon illusions or brightness/contrast effects, which are not what navigators mean by augmentation.

Question 1 of 27070

What happens because of augmentation?

The horizon appears elevated when observing a bright Sun or Moon at low altitudes.

The Moon appears larger as the elevation increases.

The Sun appears larger when viewed against the darker background of the horizon.

The Moon appears larger at the full Moon.

Question 1 / 2707066636ee928f7522a1c519871

Question 1 of 2707066636ee928f7522a1c519871

What happens because of augmentation?

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Question 1 of 27070

What happens because of augmentation?