One source of error is refraction, the bending of light beams as they pass through air layers of different temperature and pressure.
误差的一个来源是折射,即光束通过不同温度和压力的空气层时发生的弯曲现象。
2
The Chinese also launched weather balloons near their theodolites to measure atmospheric temperature and pressure changes to better estimate refraction errors.
中国还在经纬仪附近发射了气象气球来测量大气温度和压力变化,以更好地估计折射误差。
3
What would a negative index of refraction look like?