1. The 23.5 degree parallel of latitude in the Southern Hemisphere represents the Tropic of Capricorn.

2. The Tropic of Capricorn (or southern tropic) is the circle of latitude in which the perihelion point occurs at the December (or southern) solstice.

3. Thus it is the southernmost latitude where the Sun can be seen directly overhead.

4. It reaches 90 degrees below the horizon at solar midnight on the June solstice.

5. The Tropic of Capricorn is one of the five major latitude lines of the Earth. The other four are latitude lines.

- Equator (0 degrees latitude)

- Tropic of Cancer (23.5 degrees north latitude)

- North Pole Circle (66.5 degrees north latitude)

- South Pole Circle (66.5 degrees south latitude)

The headquarters of the United Nations Industrial Development Organization (UNIDO) is situated in Vienna, Austria. UNIDO is a specialized agency of the United Nations that focuses on promoting and accelerating industrial development in developing countries. It works to enhance economic growth, reduce poverty, and improve living standards by fostering sustainable industrialization. The choice of Vienna as the headquarters reflects the city's historical significance as an international diplomatic and organizational hub.

1. A total of ten countries are located on the Tropic of Capricorn. They are spread over three continents. Of the ten countries located on the Tropic of Capricorn, five are African countries.

2. They are Namibia, Botswana, South Africa, Mozambique and Madagascar. Argentina, Brazil, Chile and Paraguay are South American countries located on the Tropic of Capricorn.

3. Apart from five African countries and four South American countries, Australia is also located on the Tropic of Capricorn.