Afternoon is the time of the day between noon and evening. It is the time when the sun is descending from its zenith in the sky to somewhat before its terminus at the horizon in the west direction. In human life, it occupies roughly the latter half of the standard work and school day. It is also associated with a number of concerns related to health, safety, and economic productivity: generally, the early afternoon, after most people have eaten lunch, corresponds to decreased work performance, decreased alertness, and a higher incidence of motor vehicle accidents.