During celestial navigation with an 18th-century sextant on a rolling ship, which consequence results from temporarily unleveling the instrument during a sight?

💡 Explanation

An unlevel horizon mirror of a sextant introduces parallax error, because it shifts celestial angles relative to the true horizon, therefore yielding an inaccurate altitude measurement of the celestial body, rather than affecting timekeeping or compass readings.

• Which drawback became notable as improved astrolabes enabled finer angular resolution?
• Which benefit resulted from the annual sediment dredging in ancient Aztec chinampa agriculture?
• Which outcome inhibits crop growth when terrace farming experiences prolonged, heavy rainfall?
• Which consequence resulted when Byzantine envoys delivered diluted wine?
• Which instability increased in Mughal pietra dura art when thermal expansion differed extremely?
• Which outcome occurs when increased water table salinity impairs Mughal garden's irrigation system?