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单词 Equatorial Coordinates
释义

Equatorial Coordinates

中文百科

赤道坐标系统 Equatorial coordinate system

（重定向自Equatorial Coordinates）
Las coordenadas ecuatoriales se destacan en rojo. La eclíptica, en amarillo. El Sol -no representado- se mueve aparentemente por la eclíptica en sentido antihorario, y en el Primer punto de Aries pasa al Norte del ecuador celeste, en azul. Es la Primavera del hemisferio Norte. Cuando seis meses después llega al Punto Libra sucede lo contrario. Llega el Otoño en el Norte. Para el hemisferio Sur, a la inversa.
The equatorial coordinate system in spherical coordinates. The fundamental plane is formed by projection of the Earth's equator onto the celestial sphere, forming the celestial equator (blue). The primary direction is established by projecting the Earth's orbit onto the celestial sphere, forming the ecliptic (red), and setting up the ascending node of the ecliptic on the celestial equator, the vernal equinox. Right ascensions are measured eastward along the celestial equator from the equinox, and declinations are measured positive northward from the celestial equator - two such coordinate pairs are shown here. Projections of the Earth's north and south geographic poles form the north and south celestial poles, respectively.

赤道坐标系统，又作赤道座标系统，大概是使用得最广泛的天球坐标系统，他的元素是:

他与地理坐标系统非常相似，因为两者使用相同的基准平面和相同的极点。地球的赤道在天球上的投影就称为天球赤道，相同的，地理极点在天球上的投影就是天极。

他有两种变化：

因此，在经过一夜或数个夜晚，就能看出来星星在天空中的位置移动了，当然，这并非恒星在天球上的运动，只是地球运动造成的。因为岁差和章动的影响，在相当长的时间间隔下所做的观测，就必须注明所使用的特殊历元，为行星、恒星、星系等等的位置做记录。现在使用的历元是J2000.0分点，稍早期使用的是B1950.0分点。

英语百科

Equatorial coordinate system 赤道坐标系统

（重定向自Equatorial Coordinates）
The equatorial coordinate system in spherical coordinates. The fundamental plane is formed by projection of the Earth's equator onto the celestial sphere, forming the celestial equator (blue). The primary direction is established by projecting the Earth's orbit onto the celestial sphere, forming the ecliptic (red), and setting up the ascending node of the ecliptic on the celestial equator, the vernal equinox. Right ascensions are measured eastward along the celestial equator from the equinox, and declinations are measured positive northward from the celestial equator - two such coordinate pairs are shown here. Projections of the Earth's north and south geographic poles form the north and south celestial poles, respectively.
As seen from above the Earth's north pole, a star's local hour angle (LHA) for an observer near New York (red). Also depicted are the star's right ascension and Greenwich hour angle (GHA), the local mean sidereal time (LMST) and Greenwich mean sidereal time (GMST). The symbol ʏ identifies the vernal equinox direction.
Geocentric equatorial coordinates. The origin is the center of the Earth. The fundamental plane is the plane of the Earth's equator. 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 is the north polar axis. The reference frame does not rotate with the Earth, rather, the Earth rotates around the z axis.

The equatorial coordinate system is a widely used celestial coordinate system used to specify the positions of celestial objects. It may be implemented in spherical or rectangular coordinates, both defined by an origin at the center of the Earth, a fundamental plane consisting of the projection of the Earth's equator onto the celestial sphere (forming the celestial equator), a primary direction towards the vernal equinox, and a right-handed convention.
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更新时间：2025/6/23 1:37:33