Which limitation affected positional accuracy when using early 18th-century sextants from a rolling ship?

💡 Explanation

When using a sextant on a rolling ship, continuous changes in the apparent horizon occur because ship’s movements displace the reference line, leading to errors in celestial altitude measurements. Therefore horizon instability induces measurement error, rather than lens distortion, indexing issues, or parallax, which result from different factors.

• Which structural failure results when Roman concrete in a marine pier experiences prolonged sulfate attack?
• Which mechanism did Al-Khwarizmi's algebraic methods enable when calculating land areas during the Abbasid Caliphate era?
• Which agricultural outcome primarily resulted from Pre-Columbian terracing in the Andes?
• Which outcome results from intensified maize cultivation in the ancient Three Sisters system without nutrient replenishment?
• During Roman sieges, which consequence resulted from concentrated undermining beneath city walls?
• Which vulnerability increases when Roman fortifications extended supply lines far beyond core territory?