真黄经，在太空动力学中是天体在轨道倾角为0的轨道上真实位置的黄经值。与倾斜的升交点黄经结合，真黄经可以告诉我们在轨道上环绕中心物体运动天体的真实位置。

真黄经可以由下式求得：

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In celestial mechanics true longitude is the ecliptic longitude at which an orbiting body could actually be found if its inclination were zero. Together with the inclination and the ascending node, the true longitude can tell us the precise direction from the central object at which the body would be located at a particular time.