A Mandeville Point is an essential part of Imperial Warp travel. A Mandeville Point is defined as the minimum distance from one's destination that is safe to transition in and out of the Warp without interference from the gravity of stars or other celestial bodies. If one prematurely enters or overshoots their exit from the Warp they risk catastrophe for not only their own vessel but also nearby worlds.
There are some known methods the Imperium uses to bypass Mandeville Points. One of these is by utilizing pre-established Warp Gates built by Humanity during the Dark Age of Technology. Two of such gates are known to exist in the Sol System.