How to tell the direction in space?

There is no distinction between east, west, north, south and up in space. If you want to identify the direction, you have to judge it according to the constellation as a whole. Generally, you can judge your approximate position according to the position of the star. To say the specific location, you need to use coordinate soil, so you must first determine an origin, and assign an X, Y, z Y, Z axis direction to the coordinate map like solid geometry, and then other locations can be determined.