Which risk increased for al-Biruni calculating Earth's radius?

💡 Explanation

Systematic angular altitude errors arise if atmospheric refraction is uncorrected, because refraction makes celestial objects appear higher. Therefore inaccurate terrestrial radius calculation happened, rather than errors arising only from instrument precision.

• Which risk increases when a Viking longship runs aground during a coastal raid at high tide?
• Which outcome commonly occurred in Mughal garden water features when sediment overload blocked kanats?
• Which inaccuracy increased in celestial navigation when using a sextant after prolonged voyages?
• Which maneuver was impossible for single square-sailed Viking longships due to aerodynamic limits?
• Which degradation becomes accelerated when thermal expansion mismatches exist around Mughal pietra dura inlay?
• Which structural behavior causes arch bowing outward during settling?