What is the Tropic of Capricorn's position relative to the equator?

The Tropic of Capricorn is indeed located at 23.5 degrees south of the equator. This position marks the southernmost point where the sun can appear directly overhead at noon during the summer solstice in the Southern Hemisphere, which occurs around December 21st or 22nd each year. This geographic marker is significant for understanding the Earth's climate zones and the seasonal changes experienced in different parts of the world.

The other positions mentioned in the question, such as 23.5 degrees north, correspond to the Tropic of Cancer, which is in the Northern Hemisphere. The option stating 45 degrees south indicates a latitude further south than the Tropic of Capricorn, which does not define the tropic itself but rather regions that are generally colder and further from the equatorial sun's direct rays. Finally, 0 degrees is the equator itself, which is not where the Tropic of Capricorn is located but acts as a central dividing line for the northern and southern hemispheres.