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Southern Europe and Western Europe are the regions with the highest average number of elderly people in the world. In 2021, the percentage of people over 65 years old was 21% in Western Europe and Southern Europe, compared to 19% in all of Europe and 10% in the world. [288] Projections suggest that by 2050 Europe will reach 30%. [289]
Hemispheres of Earth. In geography and cartography, hemispheres of Earth are any division of the globe into two equal halves ( hemispheres ), typically divided into northern and southern halves by the Equator or into western and eastern halves by the Prime meridian. Hemispheres can be divided geographically or culturally, or based on religion ...
Northern Hemisphere. Northern Hemisphere shaded blue. The hemispheres appear unequal here because Antarctica is not shown. Northern Hemisphere from above the North Pole. The Northern Hemisphere is the half of Earth that is north of the Equator. For other planets in the Solar System, north is defined as being in the same celestial hemisphere ...
Knowledge of the location of Earth has been shaped by 400 years of telescopic observations, and has expanded radically since the start of the 20th century. Initially, Earth was believed to be the center of the Universe , which consisted only of those planets visible with the naked eye and an outlying sphere of fixed stars . [ 1 ]
The asterism of the Big Dipper (shown in this star map in green) lies within the constellation of Ursa Major.. The Big Dipper (US, Canada) or the Plough (UK, Ireland) is a large asterism consisting of seven bright stars of the constellation Ursa Major; six of them are of second magnitude and one, Megrez (δ), of third magnitude.
Fjord. In physical geography, a fjord or fiord ( / ˈfjɔːrd, fiːˈɔːrd / ⓘ [1]) is a long, narrow sea inlet with steep sides or cliffs, created by a glacier. [2] Fjords exist on the coasts of Antarctica, the Arctic, and surrounding landmasses of the northern and southern hemispheres. [3]
Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.
Eastern Hemisphere. The Eastern Hemisphere is the half of the planet Earth which is east of the prime meridian (which crosses Greenwich, London, United Kingdom) and west of the antimeridian (which crosses the Pacific Ocean and relatively little land from pole to pole). It is also used to refer to Afro-Eurasia ( Africa and Eurasia) and Australia ...