摘要
在白昼测天定位中，首先需要解决的问题是观测时机的问题。本文以天体周日视运动和测天定位的有利条件为依据，具体分析了几种情况下测天定位的观测时机，得出了观测的模式和确定观测时机的简单方法。
The opportunity of an observation must be first solved in day time celestial fixing. Basedon the diurnal appearant motion of heavenly body and the better conditions of celestial fixing,this paper analyses the observation opportunity in several kinds of fixing,give the model of ob- servation and the method of observation opportunity.
关键词
天文定位
高度
方位差
船舶定位
celestial fixing
observation opportunity
diurnal appearant motion of heavenly body
altitude
difference of azimuth
