Final answer:
The notion that the Earth's tilt causes the heat from the sun to be 'closer' and stronger is false. It's the direct angle of sunlight and longer daylight hours during summer that lead to warmer temperatures, not the distance from the Sun.
Step-by-step explanation:
The statement that 'the heat from the sun is closer and therefore stronger at the top of the tilt' is false. The primary reason for warmer temperatures in the Northern Hemisphere during June is not because it is physically closer to the Sun, but rather that the sunlight hits the Earth at a more direct angle due to the 23.5° tilt of Earth's axis. This direct angle results in sunlight being more concentrated and more effective at heating the surface, similar to a flashlight shining directly onto a wall versus at an angle. Moreover, if the distance to the Sun were the primary cause of the seasons, we wouldn't expect to see opposite seasons in the two hemispheres, nor would we have the coldest weather in the Northern Hemisphere when Earth is actually closest to the Sun during January.
The two effects that the tilt of Earth's axis has on making summers warmer are the higher sun angle in the sky, leading to more intense sunlight, and the longer daylight hours, which provide more time for the Sun to heat the Earth. During winter, the Sun is lower in the sky, and its rays are spread out over a larger area and the Earth has shorter daylight hours, both of which lead to less effective heating.