中都原始草原位于河北省西北部、内蒙古高原的东南端，距北京230公里，是纬度最低，距北京最近的草原。
Original grasslands are located in Hebei Province, north-west, the south-eastern Inner Mongolia Plateau, 230 kilometers from Beijing, is the lowest latitude, from Beijing's recent grassland.
根据对船位线交角的最低要求，论述了在太阳移线定位中，以中天纬度线为参考，进一步安排中天附近以外观测太阳船位线所需时间间隔的估算。
According to the angle requirement for two ships position lines, this paper proposes the method to arrange the time to take the sun sight further than the one near the noon sight.
根据对船位线交角的最低要求，论述了在太阳移线定位中，以中天纬度线为参考，进一步安排中天附近以外观测太阳船位线所需时间间隔的估算。
According to the angle requirement for two ships position lines, this paper proposes the method to arrange the time to take the sun sight further than the one near the noon sight.
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