Polaris, also called the North Star, can be used in the Northern Hemisphere to help you find north. This is one of the quickest ways to determine your directions at night if you don’t have a compass or GPS. Polaris, or the North Star, is not one of the brightest stars in the night sky (it clocks in at 48th brightest). It is, however, the brightest star between the Big Dipper and Cassiopeia.  Because it’s located in the sky around the North Pole, it doesn’t move around much, meaning it’s useful and accurate for navigating. Find the Big Dipper (also known as the Plough) and the Little Dipper (aka Ursa Minor). Think of the Big Dipper like a ladle (hence the name), where the handle holds a cup, and the outer edge of the cup (the farthest from the handle) points out into the sky and toward Polaris. For confirmation, Polaris is the last star that makes up the handle of the Little Dipper. This is approximately true north. When you face Polaris, you are facing due north; behind you is due south, and due west will be on your left, while due east will be on your right.

How would you rephrase that briefly using Vietnamese?
Nhận biết sao Bắc cực. Xác định vị trí sao Bắc cực. Vẽ một đường thẳng tưởng tượng từ sao Bắc cực xuống đất.