Which error increases when an 18th-century navigator fails to account for dip when using a sextant?

💡 Explanation

When a navigator neglects dip, also known as the height of eye, parallax error causes an overestimation of celestial altitude because the horizon appears higher than true, relative to sea level. Therefore celestial altitude is over-reported, rather than lunar distance, longitude, or local time, which depend on other calculations and timing factors.

• Which problem occurred frequently when ancient Mesopotamian irrigation canals silted up with sediment?
• Which risk increases when a square rigged 18th-century warship heels excessively during heavy weather?
• Which issue critically limited early Mesopotamian bronze tools where river sediment was highly abrasive?
• Which structural risk increased when Medieval Scottish masons narrowed aqueduct channels beyond Roman design?
• What outcome occurs from repeated use of ballista siege engines in ancient Roman warfare?
• Which risk increases when tin content falls below optimal range in early bronze metallurgy casting?