摘要
行星的自转和绕太阳公转是建立天球坐标系的事实依据。定义行星的天北极位于黄道平面以北;东南西北方向按顺时针排序。行星上的昼夜周期是太阳的周日与周年两种视运动叠加的结果。给出了在太阳系行星和卫星的天球上,恒星和太阳的视运动、昼夜周期以及昼夜长短的变化,重点描述了天王星和月球的特殊情况。
The celestial coordinate system is a coordinate system for mapping position in the sky which based on the rotation and revolution around the Sun of the planets. The north celestial pole of the equatorial plane is located at the north of the ecliptic plane, where the east, the south, the west and the north are arranged in sequence in clockwise direction. In this connection, the day/night cycle of the planets is the resultant of the superposition of the solar apparent diurnal and annual motions. Three common circumstances were presented in the celestial sphere： the apparent motions of stars and the Sum the change of the day/night cycle; and the variation of the length of the day/night on planets and satellites in the Solar System, with an emphasis on the special phenomena of Uranus and the Moon.
出处
《自然杂志》
北大核心
2008年第4期227-231,共5页
Chinese Journal of Nature
基金
国家级教学团队建设项目"科学素质教育系列公共课教学团队"(教高[2007]23号)成果之一
关键词
天球坐标系
太阳系
行星
卫星
celestial coordinate system, solar system, planet, satellite
