Aurora vs Chiyoda

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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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Chiyoda (千代田区, Chiyoda-ku) is a special ward located in central Tokyo, Japan. It is called Chiyoda City in English.It was formed in 1947 as a merger of Kanda and Kōjimachi wards after Tokyo City's transformation to Tokyo Metropolis. The modern Chiyoda ward exhibits contrasting Shitamachi and Yamanote cultural and geographical division. The Kanda region is in the heart of Shitamachi, the first commercial center of Edo-Tokyo. On the other hand, the western part of the Kōjimachi area typically represents a Yamanote district. Chiyoda consists of the Imperial Palace and a surrounding radius of about a kilometer. As of June 2020, the ward has an estimated population of 66,575, and a population density of 5,709 people per km², making it by far the least populated of the special wards. The total area is 11.66 km², of which the Imperial Palace, Hibiya Park, National Museum of Modern Art, and Yasukuni Shrine take up approximately 2.6 km², or 22% of the total area. Chiyoda is an economical powerhouse, the little region East of the palace in the districts of Otemachi, Marunouchi and Yurakucho (colloquially"Daimaruyu") houses the headquarters of 19 Fortune 500 companies, is the origin of roughly 10% of the combined earnings of all Japanese companies and produced in 2017 the equivalent of approximately 1/4th of the GDP of the nation.

With a day population of around 850,000, its day/night population ratio is by very far the highest of all municipalities in Japan. Chiyoda is also the political center of the nation, Chiyoda, literally meaning"field of a thousand generations", inherited the name in the Chiyoda Castle (the other name for Edo Castle, today's Imperial Palace). With the chair of the Emperor in the Imperial Palace at the ward's center, many government institutions, like the National Diet, the Prime Minister's Official Residence, the Supreme Court, ministries, and agencies are also located in Chiyoda, as are Tokyo landmarks like Tokyo Station, Yasukuni Shrine and the Budokan. The neighborhood Akihabara can be located in Chiyoda, as are twenty embassies and consulates.

Source: Wikipedia