Who first proposed the heliocentric model

Nicolaus Copernicus  

Explanation:

The first revolution was discussed the heliocentric model across the universe in similar as that of Ptolemy .The model was presented by the geocentric in Almagest. Therefore, the heliocentric is the system that the planets and earth revolve while at the midst of the solar energy.

The revolution of the earth was established in earlier centuries during the medieval world. However, the aspect has little interest attached to the works of the scientists during Nicolaus Copernicus's time.

for e2020. the answer would be some directions from the mountain range so we can find mt. whitney. to locate which direction is north, you should use a   compass. this would not only find mt. whitney, but also becuase of this long paragraph you would get points because it's not like anyone actually reads your work becuase once they read the first sentence it sounds dumb enough to not read becuase i'm not good at answering this but the answer is compass for your benefit.

for e2020 ; -;

answer called a epicycle;