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Sunset or sundown is the daily disappearance of the Sun below the horizon in the west as a result of Earth's rotation.

The time of sunset is defined in astronomy as the moment the trailing edge of the Sun's disk disappears below the horizon in the west. The ray path of light from the setting Sun is highly distorted near the horizon because of atmospheric refraction, making sunset appear to occur when the Sun’s disk is already about one diameter below the horizon. Sunset is distinct from dusk, which is the moment at which darkness falls, which occurs when the Sun is approximately eighteen degrees below the horizon. The period between sunset and dusk is called twilight.

Locations north of the Arctic Circle and south of the Antarctic Circle experience no sunset or sunrise at least one day of the year, when the polar day or the polar night persist continuously for 24 hours.

Sunset creates unique atmospheric conditions such as the often intense orange and red colors of the Sun and the surrounding sky.

Zanzibar ( /ˈzænzɨbɑr/; Arabic: زنجبار Zanjibār), Persian: زنگبار, from suffix bār: "coast" and Zangi: "bruin" (iron after rust); is a semi-autonomous part of Tanzania, in East Africa. It comprises the Zanzibar Archipelago in the Indian Ocean, 25–50 kilometres (16–31 mi) off the coast of the mainland, and consists of numerous small islands and two large ones: Unguja (the main island, informally referred to as Zanzibar), and Pemba. Other nearby island countries and territories include Comoros and Mayotte to the south, Mauritius and Réunion to the far southeast, and the Seychelles Islands about 1,500 km to the east. Arab and Portuguese traders visited the region in early times, and it was controlled by Omanis in the 18th and 19th centuries. Britain established a protectorate (1890) that became an independent sultanate in December 1963 and a republic after an uprising in January 1964. In April 1964 it joined Tanganyika to form a new republic that was renamed Tanzania in October 1964. (Frommers, 2002) The capital of Zanzibar, located on the island of Unguja, is Zanzibar City, and its historic centre, known as Stone Town, is a World Heritage Site.

The Zanzibar Archipelago consists of several islands lying off the coast of East Africa in the Indian Ocean. There are two main islands, plus a host of smaller islets that surround them.