Which outcome reliably indicates the precise alignment of a historical Islamic astrolabe towards Mecca using celestial observation?

💡 Explanation

Alignment towards Mecca resulted from calculating the qibla (direction), then adjusting the astrolabe until the sun’s observed altitude corresponded with the calculated values, causing the projected solar image to align above the qibla marker. Therefore the solar image indicates alignment, rather than stellar altitudes, vanes or Polaris' position, which aren't directly qibla indicators.

• Which risk increases when a square rigged 18th-century warship heels excessively during heavy weather?
• Which distortion arises when projecting Earth's spherical surface onto the flat plane of an astrolabe?
• Which navigational error rapidly accumulates when a chronometer is abruptly mechanically shocked during a lunar observation?
• Which risk increases when prolonged operation of a 18th-century wooden sailing ship occurs in tropical waters?
• Which risk accelerated the degradation of early Mesopotamian bronze tools used in irrigation canal construction?
• Which outcome results from continuous maize cultivation on steeply terraced hillsides lacking adequate drainage?