Aristarchus measured the angle between the sun and the moon when exactly half of the moon was eliminated. if the sun were actually just two or three times as far away as the moon, he would have found that angle to be:

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.

the climate of each region is different from one another.