zenith instrument

基本解释

The low-latitude meridian circle is requested to determine the transit time and the apparent zenith distance simultaneously when a star is passing across the meridian of the instrument;
为了满足低纬子午环绝对测定方法的要求，即在子午方向同时测定天体中天时刻和天顶距；
This instrument has the ability to measure polarized reflectance and bi-directional reflectance of targets at various viewing zenith angles, light incidence zenith angles and azimuth angles.
本研究利用多角度光度计实测了玉米单叶的偏振反射比与二向反射比数据。