This page describes an image Eridanus Constellation Map
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图示说明：
The constellation Eridanus with its bright stars and surrounding constellations. Eridanus is surrounded by (going clockwise from the top): Taurus, Cetus, Fornax, Phoenix, Tucana, Hydrus, Horologium, Caelum, Lepus and Orion.
Eridanus is a large constellation that spans a wide range in declination. A small portion of the constellation is in the northern hemisphere with the southern-most point lying at a declination of almost -60°. As it spans the celestial equator, parts of the constellation are visible to the whole Earth at some point in the year. The whole constellation can be observed from northern and southern equatorial regions, southern temperate regions and most of Antarctica. Eridanus is best viewed in the evening in the northern hemisphere winter and southern hemisphere summer.
The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labeled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries, nor the lines joining the stars appear on the sky.
图示来源： Adapted by the IAU Office of Astronomy for Education from the original by the IAU and Sky & Telescope. 来源链接
图示翻译状态: 尚未由审核人员批准
图示授权许可： 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标
相关术语表词条：
天球坐标
, 星座
, 猎户座
, 视星等
, 赤纬
, 赤经（RA）
, 金牛座
分类：
肉眼天文学
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