Which optical consequence arises when polishing astrolabe sighting vanes unevenly using abrasive compounds?

💡 Explanation

When sighting vanes are uneven, parallax error occurs because mismatched heights cause the observer's eye position to introduce angular displacement errors during sightings. Therefore, parallax error results, rather than other aberrations requiring specific lens shaping or material properties not directly relevant here.

• Which agricultural advantage resulted from the Olmec civilization's early maize domestication related to kernel structure?
• Which effect made Chinampa agriculture highly productive in the Valley of Mexico, circa 1400 ACE?
• Which environmental vulnerability increased significantly in areas relying heavily on maize cultivation during the pre-Columbian era?
• Which agricultural outcome influenced urban development of the Aztec civilization using chinampa cultivation?
• Which risk increases when a Roman aqueduct's arcade bridge is constructed with significantly undersized voussoirs at the crown?
• Which consequence resulted from inadequate terrace wall drainage in ancient hillside agriculture?