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Encyclopedia: Astronomical object (5108 words) |
 | The azimuth of an object in the sky is the angular distance measured eastwards along the horizon from the north point to the intersection of the object's vertical circle (the line drawn from the zenith (the point in the sky directly overhead) through the object to the horizon). |
| The galactic latitude (b) of an object in the sky is its angular distance north or south of the galactic equator. |
| The ecliptic latitude of an object in the sky is its angular distance north or south of the ecliptic. |
| Jodrell Bank Observatory: Astronomical Almanac Help (7137 words) |
| The parallactic angle of an object is the angle between the celestial pole (north or south depending on location), the object and the zenith (the point in the sky directly overhead). |
| The galactic longitude (l) of an object in the sky is its angular distance (from 0 to 360 degrees) from the nominal galactic centre measured eastwards along the galactic equator to the intersection of the great circle passing through the object. |
| The ecliptic longitude of an object in the sky is its angular distance (from 0 the 360 degrees) measured eastwards along the ecliptic from the position of the vernal equinox to the intersection of the object's great circle of longitude. |
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