How many planets are in the Earth-Centered System?

Answer 1

In theory, it is the same number as in the Sun-centered system, except that the Earth was usually not considered as a planet.

However, the Earth-centered system was abandoned before the planets

beyond Saturn were discovered.

So, in fact there were only 5 planets in the old Earth-centered system.

They were: Mercury, Venus, Mars, Jupiter and Saturn.

I think that's the best answer.

A complication is that the Sun and Moon were often referred to as "planets" by the ancient astronomers. So that makes the answer 7 "planets" .

Indeed Kepler was obsessed with trying to find reasons for there being seven

"planets":

Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn.
In the Earth centered system there were just 5 planets, because Uranus and Neptune were discovered after the Sun centered system replaced it.