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A diagram depicting the seasons of the Flat Earth. Date: 2007-08-17, 2008-01-02: ... Description=A diagram depicting the seasons of the Flat Earth. |Source=en:Image: ...
Due to the Earth’s tilt relative to the Sun, the solar declination line oscillates between the Tropic of Cancer (located at latitude 23.4° North) and the Tropic of Capricorn (located at latitude 23.4° South). This diagram shows how the tilt of Earth's axis aligns with incoming sunlight around the winter solstice of the Northern Hemisphere.
Given the different Sun incidence in different positions in the orbit, it is necessary to define a standard point of the orbit of the planet, to define the planet position in the orbit at each moment of the year w.r.t such point; this point is called with several names: vernal equinox, spring equinox, March equinox, all equivalent, and named considering northern hemisphere seasons.
See how our seasons come from Earth's tilt and yearly loop around the sun, which changes the ice cover, vegetation, and sunlight across the planet.
The following diagram illustrates the positions and relationship between the lines of solstices, equinoxes, and apsides of Earth's elliptical orbit. The six Earth images are positions along the orbital ellipse, which are sequentially the perihelion (periapsis—nearest point to the Sun) on anywhere from January 2 to January 5, the point of ...
As the Earth's axial tilt changes, [a] so too do the tropical and polar circles. The tropics constitute 39.8% of Earth's surface area [1] and contain 36% of Earth's landmass. [2] As of 2014, the region was home also to 40% of the world's population, and this figure was then projected to reach 50% by 2050.
On the summer solstice, Earth's maximum axial tilt toward the Sun is 23.44°. [7] Likewise, the Sun's declination from the celestial equator is 23.44°. In areas outside the tropics, the sun reaches its highest elevation angle at solar noon on the summer solstice. Diagram of Earth's seasons as seen from the north.
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