Aurora vs Derbent

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An aurora (plural: auroras or aurorae), sometimes referred to as polar lights (aurora polaris), northern lights (aurora borealis), or southern lights (aurora australis), is a natural light display in the Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras are the result of disturbances in the magnetosphere caused by solar wind. These disturbances are sometimes strong enough to alter the trajectories of charged particles in both solar wind and magnetospheric plasma. These particles, mainly electrons and protons, precipitate into the upper atmosphere (thermosphere/exosphere).

The resulting ionization and excitation of atmospheric constituents emit light of varying color and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles. Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes.

Source: Wikipedia

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Derbent (Russian: Дербе́нт; Persian: دربند‎; Lezgian: Кьвевар, Цал; Azerbaijani: Dərbənd; Avar: Дербенд), formerly romanized as Derbend, is a city in the Republic of Dagestan, Russia, located on the Caspian Sea. It is the southernmost city in Russia, and it is the second-most important city of Dagestan. Population: 119,200 (2010 Census); 101,031 (2002 Census); 78,371 (1989 Census).Derbent occupies the narrow gateway between the Caspian Sea and the Caucasus Mountains connecting the Eurasian Steppe to the north and the Iranian Plateau to the south.

Derbent claims to be the oldest city in Russia with historical documentation dating to the 8th century BCE, making it one of the oldest continuously inhabited cities in the World. Due to its strategic location, over the course of history, the city changed ownership many times, particularly among the Persian, Arab, Mongol, Timurid, Shirvan and Iranian kingdoms. In the 19th century, the city passed from Iranian into Russian hands by the Treaty of Gulistan of 1813.

Source: Wikipedia