the Sun, because the northern hemisphere will be heading into summer, and the north points towards the Sun during the summer.

another star, because the Earth’s axis precesses, meaning that it will move away from Polaris.

Polaris, because Polaris is so far away and even though the Earth’s axis precesses, over the period of a few months, it does not change.

the Southern Cross, because parallax means that the axis won’t be facing north anymore.