Final answer:
False. The statement is false because the definition of night does not typically include twilight, which occurs when the Sun is 18° below the horizon and still provides some light. Geographical and seasonal variations can also affect the length of night.
Step-by-step explanation:
The answer is false. The definition of night typically includes the period after the sun dips below the horizon until it rises again. However, night does not include twilight, which is a period when the sky is partially illuminated before sunrise and after sunset. According to astronomers, twilight begins or ends when the Sun is 18° below the horizon. During this time, some light is still scattered in the atmosphere, providing illumination even when the sun is not visible.
It's also important to consider geographical variations and seasonal changes. Near the equator, day and night tend to be about the same length, but as one moves toward the poles, the length of day and night can vary greatly with the seasons. Winter in the polar regions can experience polar nights, where the darkness lasts for more than 24 hours. Similarly, during the summer, they may experience the midnight sun, where the sun does not set at all.