Which problem did John Harrison's marine chronometer solve relating longitudinal calculation at sea in the 18th Century?

💡 Explanation

John Harrison's chronometer addressed determining longitude by accurately keeping Greenwich time, enabling comparison with local solar time calculated via celestial positioning; the offset determines longitude. Therefore precise time determination provided key, rather than altitude, stable oscillation, or magnetic correction, which are separate and unrelated concerns.

• During Roman siege warfare, which effect commonly resulted from undermining a stone fortification wall's foundation?
• Which risk increased for Roman castra (military camps) when constructed on peat soils?
• Which consequence results when ancient Andean terrace walls experience significant freeze-thaw cycles at high altitude?
• Which mechanical instability lead to failures in torsion-powered Roman ballista siege engines?
• Which catastrophic outcome was most likely to occur when undermining Roman fortifications during siege?
• Which structural vulnerability increased in Roman castra walls when siege engines pounded a single point repeatedly?