Analysis of observation error of the declination with bias current by vector proton precession magnetometer
分量核旋仪偏置电流对磁偏角测量的影响分析
Study and Analysis on Abnormal Changes in Magnetic Declination and Earthquake Precursory Anomaly at Mengcheng Magnetic Station
蒙城台磁偏角非正常变化与地震前兆异常的分析与研究
A large reflect meridian circle is an instrument for the absolute determination of the declination and right ascension of a star.
大型反射子午环是用来绝对测定恒星赤经和赤纬的仪器。
From August,2003, the changes in magnetic declination of relative observation are large than that before at Mengcheng magnetic station.
蒙城地磁台相对观测磁偏角自2003年8月起，变化较大。
Of summer nights in northern latitudes where the sun barely sets. Match Relations Between Sunrise and Sunset Hour Angles of Slope Surfaces and Solar Declination
坡面日出日没时角的配置关系与太阳赤纬
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