Current model of the solar system
vs.
historical model of the solar system

Which "Historical" models? 
Ptolemy's model? 
Brahe's model? 
Copernicus' model? 
Kepler's model? 

Historical Model 
Shows the planet's orbits as perfect circles, not ellipses. 
Earth centered solar system. 
Did not show how planets such as Neptune, Uranus, etc. 

Modern model 
Shows the orbits as ellipses. 
Shows a heliocentric solar system. 
Shows all the planets we know today. 

DIFFERENCES: 
Planets move around the sun, as different from Ptolemaic. 
Planets move in ellipses, as opposed to Copernican circles. 
All planets revolve around the sun, as different from the Tychonic view. 
The spacing of planetary orbits are a matter of chance, as opposed to Kepler's harmonic distances. 
Two new planets (Neptune & Uranus) 
Discovered the Asteroid Belt. 
Found that planets orbit the sun, not the Earth. 
Discovered that Saturn has rings. 

SIMILARITIES: 
We still have our moon orbiting the Earth. 
We can only see the planets at night. 
We can only see the sun at day. 
Both are based on the same solar system. 
Both show the inner planets, the Moon, the Sun, Jupiter, and Saturn. 
Both were made by many observations of the sky.

You can still be friends with each other. you don't have to date since he likes someone else. just stick to being friends for now