Answer:
First Blank - Geocentric model
Second Blank - Heliocentric model
Explanation:
In a geocentric model, the earth is assumed to be at the center of the solar system and all other planets , sun and moon (earth's natural satellite) revolve around the earth.
While in a heliocentric model, the sun is assumed to be at the center of the solar system and all other planets including the earth and moon revolve around the sun in elliptical orbit.
