Astronomy. Of the motion of a planet, etc.: Proceeding in the order of the zodiacal signs, in the same direction as the sun in the ecliptic, i.e…

Of, relating to, or involving progression (in various senses); progressing, progressive.

of or relating to profection or progression, esp. of celestial bodies.

Originally, of a planet or its motion: proceeding in the same direction as the sun around the ecliptic, i.e. from west to east as seen from the…