低纬子午环不同方向放置误差的测定方法

A Method for Determining the Errors Caused When the Lower Latitude Meridian Circle is Put in Different Directions

为了满足低纬子午环在不同方向放置的高重复精度要求,并且保证仪器的子午方向与卯酉方向严格垂直,本文提出了用准直管一立方反射镜系统,在每颗星观测时测定和修正仪器在不同方向的放置误差。采用这种方法能使仪器在不同方向放置的重复精度优于±0″.01。

In order to obtain the highly repeated accuracy which is needed when the lower latitude meridian circle(LLMC)is put in different directions and to ensure that the meridian direction of the instrument should be strictly perpendicular to the prime vertical,a system consisting of a collimator and a cubic reflector is used to determine and correct the errors produced when the LLMC is put in different directions during the observation of a star,thereby making the repeated accuracy better than ±0'.01.