Final answer:
The lights in the park are most likely controlled by a. sensor that responds to the brightness of sunlight.
Step-by-step explanation:
The most plausible explanation for the lights in the park going on approximately 15 minutes after sunset and going off just before sunrise is that the lights are controlled by a sensor that responds to the brightness of the sunlight. This means that the lights automatically adjust based on the amount of sunlight available. When the sun sets and it starts getting darker, the sensor detects the decrease in sunlight and turns on the lights.
Conversely, when the sun rises and it starts getting brighter, the sensor detects the increase in sunlight and turns off the lights. Thus, where the lights are controlled by a timer programmed to turn them on and off at the same time every day, is the most plausible explanation for the behavior of the lights in the park near your home.