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  2. Location of Earth - Wikipedia

    en.wikipedia.org/wiki/Location_of_Earth

    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 center of Earth's observable universe. Reference can be made to the Earth's position with respect to specific structures, which exist at various scales.

  3. Biosphere 2 - Wikipedia

    en.wikipedia.org/wiki/Biosphere_2

    Its mission is to serve as a center for research, outreach, teaching, and lifelong learning about Earth, its living systems, and its place in the universe. [1] It is a 3.14-acre (1.27-hectare) [ 2 ] structure originally built to be an artificial, materially closed ecological system , or vivarium .

  4. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    Earth's rotational velocity also varies in a phenomenon known as length-of-day variation. [170] 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.

  5. Wikipedia : Picture peer review/Earth's Location in the Universe

    en.wikipedia.org/wiki/Wikipedia:Picture_peer...

    Original - A diagram of Earth’s location in the Universe in a series of eight maps that show from left to right, the Earth, inside the Solar System, inside the Solar Interstellar Neighborhood, inside the Milky Way, inside the Local Galactic Group, inside the Virgo Supercluster, inside our local superclusters, and finally finishing inside the entire observable Universe.

  6. Geocentric model - Wikipedia

    en.wikipedia.org/wiki/Geocentric_model

    Ptolemy argued that the Earth was a sphere in the center of the universe, from the simple observation that half the stars were above the horizon and half were below the horizon at any time (stars on rotating stellar sphere), and the assumption that the stars were all at some modest distance from the center of the universe. If the Earth were ...

  7. Geographical centre of Earth - Wikipedia

    en.wikipedia.org/wiki/Geographical_centre_of_Earth

    Geometrically defined it is the centroid of all land surfaces within the two dimensions of the Geoid surface which approximates the Earth's outer shape. The term centre of minimum distance [ 1 ] specifies the concept more precisely as the domain is the sphere surface without boundary and not the three-dimensional body.

  8. Backyard Universe: Earth lights up the crescent moon - AOL

    www.aol.com/backyard-universe-earth-lights...

    Earthshine has been around as long as the moon and Earth have, but it took awhile for humans to understand the cause of it. ... If you have a question about astronomy send it to Backyard Universe ...

  9. Cosmic Calendar - Wikipedia

    en.wikipedia.org/wiki/Cosmic_Calendar

    The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.

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