If the moon was hit by a large asteroid, it could potentially alter its orbit or rotation, which would affect the timing and appearance of lunar phases. The impact could cause the moon to tilt on its axis, leading to changes in the angle at which sunlight hits its surface and consequently, altering the visibility and timing of its phases. Additionally, the impact could also create debris and dust that could temporarily obscure the moon, further affecting its appearance in the sky. Ultimately, the exact changes to lunar phases would depend on the size and location of the impact, but it is likely that there would be visible differences in the timing and appearance of the moon's phases following such an event.
