The period from one-half hour before sunrise to one-half hour after sunrise defines what term?

The period from one-half hour before sunrise to one-half hour after sunrise is defined as dawn. This time frame typically marks the transition from night to daylight, where the first light begins to appear in the sky before the sun actually rises and continues for a brief period after sunrise. Understanding this definition is important for various traffic regulations and safety measures, as visibility conditions change significantly during dawn.

The term "daylight" generally refers to the entire period when sunlight is present, which extends beyond just the time around sunrise. "Daytime" encompasses the full duration of daylight, including both the morning and afternoon light. "Sunrise" specifically refers to the exact moment the sun breaks the horizon, rather than a time range. Thus, the correct answer captures this specific time frame focused on the gradual increase in light before the sun rises.