Lisbon (Portuguese: Lisboa; [liʒˈboɐ]) is the capital and largest city of Portugal. It is considered an alpha global city and is the seat of the district of Lisbon and the main city of the Lisbon region. Its municipality, which matches the city proper excluding the larger continuous conurbation, has a municipal population of 564,477 in 84.8 km² (33 sq mi), while the Lisbon Metropolitan Area in total has around 2.8 million inhabitants, and 3.34 million people live in the broader agglomeration of Lisbon Metropolitan Region (includes cities ranging from Leiria to Setúbal).

Due to its economic output, standard of living, and market size, the Grande Lisboa (Greater Lisbon) subregion is considered the second most important financial and economic centre in the Iberian Peninsula. The Lisbon region is the wealthiest region in Portugal and it is well above the European Union's GDP per capita average – it produces 37% of the Portuguese GDP. It is also the political centre of the country, as seat of government and residence of the Head of State.

Portugal /ˈpɔrtjəɡəl/ , officially the Portuguese Republic (Portuguese: República Portuguesa), is a country located in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of mainland Europe and is bordered by the Atlantic Ocean to the west and south and by Spain to the north and east. The Atlantic archipelagos of the Azores and Madeira are also part of Portugal.

The land within the borders of today's Portuguese Republic has been continuously settled since prehistoric times. Gallaeci, Lusitanians, Celtici, Cynetes, Phoenicians, Carthaginians Romans and many Germanic tribes such as the Suevi, the Buri and the Visigoths, all left their influence on what is today Portuguese territory. The territory was integrated in the Roman Empire as the province of Lusitania and Roman settlers strongly influenced Portuguese culture, particularly the Portuguese language, mostly derived from Latin. In the 5th century, after the fall of the Roman empire, it was occupied by different Germanic tribes. In the early 8th century the Muslim Moors conquered the Christian Germanic kingdoms, occupying most of the Iberian Peninsula. Later, during the Christian Reconquista (Reconquering), the County of Portugal was settled, as part of the Kingdom of Galicia. Portugal emerged during the 12th century from this brief earldom and would establish almost its entire modern-day borders in 1249.

Sunset is the daily disappearance of the sun below the horizon as a result of the Earth's rotation. The atmospheric conditions created by the setting of the sun, occurring before and after it disappears below the horizon, are also commonly referred to as "sunset".

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. Due to refraction of light in the atmosphere, the ray path of the setting sun is highly distorted near the horizon making the apparent astronomical sunset occur when the sun’s disk is already about one diameter below the horizon. Sunset should not be confused with dusk, which is the moment at which darkness falls, when the sun is about eighteen degrees below the horizon. The period between the astronomical sunset and dusk is called twilight.

The District of Lisbon (Lisboa, [liʒˈbo.ɐ]) is located in the South Central Portugal, the District Capital is the city of Lisbon, also the national Capital.

The district is composed of 16 municipalities: