Northern Hemisphere

NorthernNorth HemisphereNorthern HemisphericBorealhemispherenNorthnorthern celestial hemispherenorthern halfnorthern latitudes
The Northern Hemisphere is the half of Earth that is north of the Equator.wikipedia
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Equator

equatorial planeThe Equator
The Northern Hemisphere is the half of Earth that is north of the Equator.
It is the imaginary line on the spheroid, equidistant from its poles, dividing it into northern and southern hemispheres.

North Pole

NorthGeographic North Pole90
For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's North Pole.
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is (subject to the caveats explained below) defined as the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface.

Winter

austral wintermeteorological winterwintering
Owing to the Earth's axial tilt, winter in the Northern Hemisphere lasts from the December solstice (typically December 21 UTC) to the March equinox (typically March 20 UTC), while summer lasts from the June solstice through to the September equinox (typically on 23 September UTC).
When it is winter in the Northern Hemisphere, it is summer in the Southern Hemisphere, and vice versa.

North

NNordNorth Korea
The Northern Hemisphere is the half of Earth that is north of the Equator.
The direction north is often associated with colder climates because most of the world's land at high latitudes is located in the Northern Hemisphere.

Summer

summer seasonaustral summersummers
Owing to the Earth's axial tilt, winter in the Northern Hemisphere lasts from the December solstice (typically December 21 UTC) to the March equinox (typically March 20 UTC), while summer lasts from the June solstice through to the September equinox (typically on 23 September UTC).
When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere, and vice versa.

Equinox

autumnal equinoxautumn equinoxequinoxes
Owing to the Earth's axial tilt, winter in the Northern Hemisphere lasts from the December solstice (typically December 21 UTC) to the March equinox (typically March 20 UTC), while summer lasts from the June solstice through to the September equinox (typically on 23 September UTC).
In the Northern Hemisphere, the March equinox is called the vernal or spring equinox while the September equinox is called the autumnal or fall equinox.

Southern Hemisphere

SouthernaustralS. Hemisphere
Its surface is 60.7% water, compared with 80.9% water in the case of the Southern Hemisphere, and it contains 67.3% of Earth's land.
Its surface is 80.9% water, compared with 60.7% water in the case of the Northern Hemisphere, and it contains 32.7% of Earth's land.

Tropic of Cancer

Cancertropic23.44° north
Between the Arctic Circle and the Tropic of Cancer (23°26′ latitude) lies the Northern temperate zone.
This occurs on the June solstice, when the Northern Hemisphere is tilted toward the Sun to its maximum extent.

Solstice

solsticessummer solsticewinter solstice
Owing to the Earth's axial tilt, winter in the Northern Hemisphere lasts from the December solstice (typically December 21 UTC) to the March equinox (typically March 20 UTC), while summer lasts from the June solstice through to the September equinox (typically on 23 September UTC).

Earth

Earth's surfaceterrestrialworld
The Northern Hemisphere is the half of Earth that is north of the Equator.
This causes the seasonal change in climate, with summer in the Northern Hemisphere occurring when the Tropic of Cancer is facing the Sun, and winter taking place when the Tropic of Capricorn in the Southern Hemisphere faces the Sun.

Axial tilt

obliquityobliquity of the eclipticaxis
Owing to the Earth's axial tilt, winter in the Northern Hemisphere lasts from the December solstice (typically December 21 UTC) to the March equinox (typically March 20 UTC), while summer lasts from the June solstice through to the September equinox (typically on 23 September UTC).
Summer occurs in the Northern hemisphere when the north pole is directed toward the Sun.

Tropics

tropicaltropictropical zone
Tropical regions (between the Tropic of Cancer and the Equator, 0° latitude) are generally hot all year round and tend to experience a rainy season during the summer months, and a dry season during the winter months.
They are delimited in latitude by the Tropic of Cancer in the Northern Hemisphere at N and the Tropic of Capricorn in

Arctic Circle

circumpolarArcticCircumpolar arctic
Areas inside the Arctic Circle (66°34′ latitude) experience some days in summer when the Sun never sets, and some days during the winter when it never rises.
The Arctic Circle is the southernmost latitude in the Northern Hemisphere at which the centre of the sun can remain continuously above or below the horizon for twenty-four hours; as a result, at least once each year at any location within the Arctic Circle the sun is visible at local midnight, and at least once the centre is not visible at local noon.

Coriolis force

Coriolis effectCoriolisCoriolis acceleration
In the Northern Hemisphere, objects moving across or above the surface of the Earth tend to turn to the right because of the Coriolis effect.
This force causes moving objects on the surface of the Earth to be deflected to the right (with respect to the direction of travel) in the Northern Hemisphere and to the left in the Southern Hemisphere.

Tropical cyclone

hurricanetropical stormhurricanes
Hurricanes and tropical storms (massive low-pressure systems) spin counter-clockwise in the Northern Hemisphere.
"Cyclone" refers to their winds moving in a circle, whirling round their central clear eye, with their winds blowing counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.

Europe

EuropeanEUEuropean continent
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere.

Ocean gyre

gyreOceanic gyresoceanic gyre
As a result, large-scale horizontal flows of air or water tend to form clockwise-turning gyres.
Circulation around the high pressure is clockwise in the northern hemisphere and counterclockwise in the southern hemisphere, due to the Coriolis effect.

North America

NorthNorth AmericanNA
North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere.

Temperate climate

temperatetemperate zonetemperate zones
Between the Arctic Circle and the Tropic of Cancer (23°26′ latitude) lies the Northern temperate zone.
They are almost exclusively found only on the northern hemisphere, because this is where there is a large enough landmass to generate extremes in seasonal temperatures.

Asia

AsianAsian continentAsian countries
Asia is Earth's largest and most populous continent, located primarily in the Eastern and Northern Hemispheres.

Africa

African continentAfricanAfrican politics
The majority of the continent and its countries are in the Northern Hemisphere, with a substantial portion and number of countries in the Southern Hemisphere.

South America

South AmericanSouthSouth-America
South America is a continent in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere.

Pacific Ocean

PacificSouth PacificWestern Pacific
These are best seen in ocean circulation patterns in the North Atlantic and North Pacific oceans.
The motion of Pacific waters is generally clockwise in the Northern Hemisphere (the North Pacific gyre) and counter-clockwise in the Southern Hemisphere.

Solar System

outer Solar Systeminner Solar Systemouter planets
For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's North Pole.

Invariable plane

common orbital alignmentinvariable plane of the Solar System“invariable” axis
For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's North Pole.