反银心是理论上在天空中相对于银河系银河中心的点。由于这个点是相对应的，它将会随着观测者的位置而改变；而不是在空间中固定不变的点。绝大部份的场合，这个术语是指从地球上观测者的角度来看的反银心点。此外，它在天空中所指出的点并不会限于有限的区域；换言之，不同星系中的两个天体，只要它们都在银河系中心相反的方向上，就都可以在银河的反银心上 (就像恒星在星座之中一样，可能除了在视在线是相同的方向之外，彼此之间毫无关系)。

从地球上的观测者的角度来看，反银心的位置在御夫座，而五车五是最接近这个点的亮星。

在银河座标系统，银心在人马座的方向上，对应于银经0°，而反银心在 180°之处。在赤道座标系统，反银心的位置可以在大约 赤经05h 46m，赤纬+28°56'。

The galactic anticenter is a theoretical point in the sky that lies directly opposite the center of the Milky Way. Because this point is relative, it will vary depending on the location of the observer; it is not an actual fixed point in space. Most of the time, this term refers to the anticenter from the point of view of an observer on Earth. Moreover, points within the sky are not confined to a finite area; in other words, two objects in different galaxies can both be in the galactic anticenter as long as they are in the direction opposite of the direction of the galactic center (much like how the stars in a constellation may be completely unrelated despite appearing visually close to each other).