Question

an eccentric billionaire wants to build a mansion in a location on earth where the effect of the seasons is the least pronounced -- where summer and winter are not that different. where should his personal astronomer advise him to build? at the tropic of capricorn (23° s) at the equator at the tropic of cancer (23° n) at the north pole at the south pole

Explanation:

The equator receives relatively consistent sunlight throughout the year due to its position between the Tropic of Cancer and the Tropic of Capricorn. This results in less - pronounced seasonal differences compared to the poles and the tropics.

Answer:

At the equator