user: From the passage provided, summarise the key phases of sunset.

assistant: Sunset is divided into three stages. The first is twilight, which begins once the Sun has disappears below the horizon, and continues until it descends to 6 degrees below the horizon. The second phase is nautical twilight, between 6 and 12 degrees below the horizon. The third phase is astronomical twilight, which is the period when the Sun is between 12 and 18 degrees below the horizon.

user: Which amendment to the US constitution protects the rights of its citizens to own shotguns?

assistant: The Second Amendment (Amendment II) to the US Constitution protects the right to keep and bear arms.

user: How many Olympic rings are there?

assistant: There are five Olympic rings that represent the union of the five continents and the meeting of athletes from throughout the world at the Olympic Games.