黄道坐标系 Ecliptic coordinate system
（重定向自Celestial latitude）
黄道坐标系，又作黄道座标系，是以黄道作基准平面的天球坐标系统，多用作研究太阳系天体运动情况之用。
Celestial latitude
中文百科
英语百科
Ecliptic coordinate system 黄道坐标系
（重定向自Celestial latitude）
![Earth-centered ecliptic coordinates as seen from outside the celestial sphere. Ecliptic longitude (red) is measured along the ecliptic from the vernal equinox. Ecliptic latitude (yellow) is measured perpendicular to the ecliptic. A full globe is shown here, although high-latitude coordinates are seldom seen except for certain comets and asteroids.](/Images/godic/202501/03/Ecliptic_grid_globe2604.png")
![The apparent motion of the Sun along the ecliptic (red) as seen on the inside of the celestial sphere. Ecliptic coordinates appear in (red). The celestial equator (blue) and the equatorial coordinates (blue), being inclined to the ecliptic, appear to wobble as the Sun advances.](/Images/godic/202501/03/Ecliptic_vs_equator_small2604.gif")
![Heliocentric ecliptic coordinates. The origin is the center of the Sun. The fundamental plane is the plane of the ecliptic. The primary direction (the x axis) is the vernal equinox. A right-handed convention specifies a y axis 90° to the east in the fundamental plane; the z axis points toward the north ecliptic pole. The reference frame is relatively stationary, aligned with the vernal equinox.](/Images/godic/202501/03/Heliocentric_rectangular_ecliptic2604.png")
The ecliptic coordinate system is a celestial coordinate system commonly used for representing the positions and orbits of Solar System objects. Because most planets (except Mercury), and many small Solar System bodies have orbits with small inclinations to the ecliptic, it is convenient to use it as the fundamental plane. The system's origin can be either the center of the Sun or the center of the Earth, its primary direction is towards the vernal (northbound) equinox, and it has a right-handed convention. It may be implemented in spherical coordinates or rectangular coordinates.