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;
爲了滿足低緯子午環絕對測定方法的要求，即在子午方曏同時測定天躰中天時刻和天頂距；
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計實測了玉米單葉的偏振反射比與二曏反射比數據。