The moment of solar disappearance below the horizon varies daily and depends on the observer’s location. For Tucson, Arizona, this time fluctuates throughout the year, influenced by the Earth’s orbit and axial tilt. The latest sunset occurs around the summer solstice, while the earliest takes place near the winter solstice.
Knowledge of the daily sunset time is beneficial for planning outdoor activities, optimizing energy consumption by anticipating the need for artificial lighting, and for astronomical observations. Historically, sunset times have been significant for religious practices, agricultural schedules, and marking the end of the traditional workday.