Which mechanism was crucial in enabling accurate celestial navigation using a Kamal during the medieval Islamic period?

💡 Explanation

The Kamal relies on measuring the angular distance between the horizon and Polaris (or other known stars) using a string held to a marked wooden rectangle, because this provides a direct indication of latitude. Therefore, measuring the angle to Polaris is crucial, rather than alternatives that involve time, eclipses, or planetary orbits differently.

• Which outcome arose from the Roman army employing articulated siege towers during sieges?
• Which risk increased along Roman roads during winter due to repeated freeze-thaw cycles affecting roadbed materials?
• Which mechanical effect limited the canal dimensions used during the early Mesopotamian Uruk period?
• Which constraint limited blade length during the Bronze Age sword manufacture process?
• Which outcome resulted from the practice of chinampa agriculture as water salinity increased?
• Which optical phenomenon underlies the operation of an Ibn al-Haytham's 'camera obscura' used for astronomical observations?