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orbit
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Earth's orbit
Understand how the Earth remain stable in orbit around the sun
What causes the seasons?
Planet's orbital plane in relation to the ecliptic Anomaly A-aphelion; B-perihelion; C-centre of the orbit; E-eccentric anomaly; P-planet; S-Sun; V-true anomaly satellite orbits effects of gravity on the Moon and Earth A Poincaré section, or mapThe trajectory, or orbit, of an object x is sampled periodically, as indicated by the blue disk. The rate of change for the object is determined for each intersection of its orbit with the disk, as shown by P(x) and P2(x). This set of values can then be used to analyze the long-term stability of the system. For contrast, note the perfectly periodic orbit of the point o, as indicated by o = P(o).
Study how Earth's gravity influences the Moon in maintaining its rotation in sync, with one side forever facing Earth
Learn about Io, Jupiter's moon with the most active volcanoes in the solar system
Quizzes
View of the Andromeda Galaxy (Messier 31, M31).
Astronomy and Space Quiz
The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
Space Odyssey
Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy
Discover
Santa Claus flying in his sleigh, christmas, reindeer
Was Santa Claus a Real Person?
Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics
10 Greatest Baseball Players of All Time
Woman tied to a ducking stool, a method of punishment by means of humiliation, beating, or death. (cucking stool)
8 Unusual Punishments Inflicted on Women Throughout History
Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden
7 Winter Solstice Celebrations From Around the World
Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that
America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)
Thanksgiving Turkey with all the sides
Why Do We Eat Turkey on Thanksgiving?
Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.
12 Greek Gods and Goddesses

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Videos

Understand how the Earth remain stable in orbit around the sun
How Earth is able to remain in orbit by balancing speed and gravitational pull from...
Video: © MinutePhysics (A Britannica Publishing Partner)
What causes the seasons?
In many parts of the world, weather cycles through the four seasons like clockwork:...
Video: Encyclopædia Britannica, Inc.
Study how Earth's gravity influences the Moon in maintaining its rotation in sync, with one side forever facing Earth
Learn about the role that Earth's gravity plays in keeping one hemisphere of the...
Video: © MinuteEarth (A Britannica Publishing Partner)
Learn about Io, Jupiter's moon with the most active volcanoes in the solar system
An overview of Io, a moon of Jupiter with many active volcanoes.
Video: © Open University (A Britannica Publishing Partner)
Learn more about the Nice model of solar system evolution and how samples brought back from the Moon fit within it
A discussion of the Nice model (named for Nice, France) of the formation of the orbital...
Video: © Open University (A Britannica Publishing Partner)
How Earth's orbit and tilt create seasons
The role of Earth's orbit and axis in determining its seasons.
Video: Encyclopædia Britannica, Inc.
Understanding Newton's theory of universal gravitation
Isaac Newton's formulation of the law of universal gravitation.
Video: Encyclopædia Britannica, Inc.
How does Earth orbit around the Sun?
Explanation of how objects under the influence of gravity move in orbits.
Video: Encyclopædia Britannica, Inc.

Images

Earth's orbit
Earth's orbit around the Sun. Earth orbits around the Sun with a period of one year.
Encyclopædia Britannica, Inc.
Encyclopædia Britannica, Inc.
Anomaly A-aphelion; B-perihelion; C-centre of the orbit; E-eccentric anomaly;...
Encyclopædia Britannica, Inc.
satellite orbits
Basic characteristics of orbits in which a satellite can be placed around Earth,...
Encyclopædia Britannica, Inc.
effects of gravity on the Moon and Earth
Effects of gravity on Earth and the Moon.
Encyclopædia Britannica, Inc.
A Poincaré section, or mapThe trajectory,...
Encyclopædia Britannica, Inc.
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