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Created by Commons user Mike1024, Earth based on File:Worldmap northern.svg: Author: Image of earth: Gringer. Scale orbits: Mike1024: Permission (Reusing this file) This image is based on a public domain image (File:Worldmap northern.svg) and is released into the public domain.
By astronomical convention, the four seasons are determined by the solstices (the two points in the Earth's orbit of the maximum tilt of the Earth's axis, toward the Sun or away from the Sun) and the equinoxes (the two points in the Earth's orbit where the Earth's tilted axis and an imaginary line drawn from the Earth to the Sun are exactly ...
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.
Orbit Center-to-center distance Altitude above the Earth's surface Speed Orbital period Specific orbital energy; Earth's own rotation at surface (for comparison— not an orbit) 6,378 km: 0 km: 465.1 m/s (1,674 km/h or 1,040 mph) 23 h 56 min 4.09 sec: −62.6 MJ/kg: Orbiting at Earth's surface (equator) theoretical 6,378 km: 0 km
This template is an infobox for planets. Template parameters This template prefers block formatting of parameters. Parameter Description Type Status extrasolarplanet extrasolarplanet no description Unknown optional exosolar planets exosolar planets no description Unknown optional minorplanet minorplanet When given a value (e.g., yes), it changes labels, section headings, and links to a ...
This is a diagram of the seasons. Regardless of the time of day (i.e. Earth 's rotation on its axis), the North Pole will be dark, and the South Pole will be illuminated; see also arctic winter . Figure 3 shows the angle of sunlight striking Earth in the Northern and Southern Hemispheres when Earth's northern axis is tilted away from the Sun ...
To change this template's initial visibility, the |state= parameter may be used: {{ Orbits | state = expanded }} will show the template expanded, i.e. fully visible. {{ Orbits | state = autocollapse }} will show the template autocollapsed, i.e. if there is another collapsible item on the page (a navbox, sidebar , or table with the collapsible ...
The Earth's orbit approximates an ellipse. Eccentricity measures the departure of this ellipse from circularity. The shape of the Earth's orbit varies between nearly circular (theoretically the eccentricity can hit zero) and mildly elliptical (highest eccentricity was 0.0679 in the last 250 million years). [7] Its geometric or logarithmic mean ...