Final answer:
If Earth did not revolve around the Sun, there would be no seasons, as the conditions on Earth would be uniform with a consistent day length and sunlight intensity throughout the year due to its uniform exposure to the Sun.
Step-by-step explanation:
If the Earth did not revolve around the Sun and stayed in one fixed position relative to it, the concept of seasons as we know them would not exist. Factors such as Earth's 23.5° tilt and its elliptical orbit play crucial roles in creating the varying conditions that lead to the cycle of seasons. Without these, temperatures and climate patterns on Earth would be remarkably uniform throughout the year.
Currently, during the summer in the Northern Hemisphere, that part of Earth "leans into" the Sun, receiving more direct sunlight, which leads to longer days and warmer temperatures. Conversely, during its winter, the Northern Hemisphere leans away, resulting in shorter days and colder conditions. The opposite happens in the Southern Hemisphere during the same periods. If Earth's axis were not tilted, we would not experience such drastic changes in sunlight and temperature - the Sun's path and day length would remain fairly consistent year-round. As such, the seasonal variations we experience, governed by sunlight intensity and day length, would be significantly diminished, affecting ecosystems, weather patterns, and human activities on a global scale.