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Since there is believed to be no "center" or "edge" of the Universe, there is no particular reference point with which to plot the overall location of the Earth in the universe. [8] Because the observable universe is defined as that region of the Universe visible to terrestrial observers, Earth is, because of the constancy of the speed of light ...
The Earth's central position had been interpreted as being in the "lowest and filthiest parts". Instead, as Galileo said, the Earth is part of the "dance of the stars" rather than the "sump where the universe's filth and ephemera collect". [4] [5] In the late 20th Century, Carl Sagan asked, "Who are we? We find that we live on an insignificant ...
Earth's rotational velocity also varies in a phenomenon known as length-of-day variation. [171] Earth's annual orbit is elliptical rather than circular, and its closest approach to the Sun is called perihelion. In modern times, Earth's perihelion occurs around 3 January, and its aphelion around 4 July.
In ancient and medieval times, only objects visible to the naked eye—the Sun, the Moon, the five classical planets, and comets, along with phenomena now known to take place in Earth's atmosphere, like meteors and aurorae—were known. [dubious – discuss] Ancient astronomers were able to make geometric observations with various instruments.
Physical characteristics of the Earth Figure of the Earth; Structure of the Earth. Earth's crust; Earth's mantle; Earth's outer core; Earth's inner core; Earth's magnetic field; Atmosphere of Earth; Geology of Earth. Lithosphere of Earth. Plate tectonics; Hydrosphere of Earth Water distribution on Earth; Tides; Physical characteristics of Mars ...
Fremont, Seattle, Washington – a neighborhood in Seattle is the “official” Center of the Universe: sign at the Center of the Universe. John B. Lindale House in Magnolia, Delaware – displays a sign proclaiming "This is Magnolia, the Center of the Universe around which the Earth revolves". [17] New York City [1] [18]
See Earth's location in the universe for an orientation. Subfields of astronomy: Astrophysics – branch of astronomy that deals with the physics of the universe, including the physical properties of celestial objects, as well as their interactions and behavior. [3]
Ignoring the influence of other Solar System bodies, Earth's orbit, also called Earth's revolution, is an ellipse with the Earth–Sun barycenter as one focus with a current eccentricity of 0.0167. Since this value is close to zero, the center of the orbit is relatively close to the center of the Sun (relative to the size of the orbit).
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