The part of Earth that receives the greatest total amount of solar radiation when it is in position is the equator.

Here's why:

* Angle of Incidence: The equator receives sunlight at a near-perpendicular angle (close to 90 degrees) throughout the year. This means the sunlight is concentrated over a smaller area, leading to higher intensity.

* Daylight Hours: The equator experiences roughly 12 hours of daylight throughout the year. This means it receives sunlight for a longer period than areas further away from the equator.

While the tropics, which lie around the equator, also receive a significant amount of solar radiation, the equator itself gets the most. This is why the equator is known for its warm climate and lush vegetation.