1, the planets we see on the earth all have the phenomenon of staying, because the revolution speed of each other is different, and the planets close to the sun are faster, so it will definitely happen;

2. "Stay" refers to the moment when the right ascension coordinate of the planet on the starry sky background changes to zero and is ready to change its moving direction;

3. "Forward" means that the planet moves from west to east under the starry sky background (the sun also moves in this direction), and "reverse" means that it moves from east to west;

4. Forward and backward are the directions of planetary motion seen on the earth. When the orbit of the inner planet exceeds that of the outer planet, it seems that the outer planet is retrograde from the inner planet, and you will see the retrograde situation.