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  2. Earth's rotation - Wikipedia

    en.wikipedia.org/wiki/Earth's_rotation

    Earth's rotation. Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space. Earth rotates eastward, in prograde motion. As viewed from the northern polar star Polaris, Earth turns counterclockwise . The North Pole, also known as the Geographic North ...

  3. Rotation period (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Rotation_period_(astronomy)

    In astronomy, the rotation periodor spin period[1]of a celestial object(e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the sidereal rotation period(or sidereal day), i.e., the time that the object takes to complete a full rotationaround its axisrelative to the background stars (inertial space).

  4. Venus - Wikipedia

    en.wikipedia.org/wiki/Venus

    Venus is one of the four terrestrial planets in the Solar System, meaning that it is a rocky body like Earth. It is similar to Earth in size and mass and is often described as Earth's "sister" or "twin". [ 33] Venus is close to spherical due to its slow rotation. [ 34]

  5. Axial tilt - Wikipedia

    en.wikipedia.org/wiki/Axial_tilt

    The axial tilt is defined as the angle between the direction of the positive pole and the normal to the orbital plane. The angles for Earth, Uranus, and Venus are approximately 23°, 97°, and 177° respectively. In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, which is ...

  6. Orbit of Venus - Wikipedia

    en.wikipedia.org/wiki/Orbit_of_Venus

    Venus has an orbit with a semi-major axis of 0.723 au (108,200,000 km; 67,200,000 mi ), and an eccentricity of 0.007. [1] [2] The low eccentricity and comparatively small size of its orbit give Venus the least range in distance between perihelion and aphelion of the planets: 1.46 million km. The planet orbits the Sun once every 225 days [3] and ...

  7. Why isn’t Venus like Earth? New space mission aims to find out

    www.aol.com/space-missions-probe-mysteries-venus...

    Together, the three spacecraft will fly behind Earth as it orbits the sun, about 50 million kilometers (31 million miles) from our planet. The agency expects the mission to last four years, with ...

  8. Earth orientation parameters - Wikipedia

    en.wikipedia.org/wiki/Earth_Orientation_Parameters

    In geodesy and astrometry, earth orientation parameters ( EOP) describe irregularities in the rotation of planet Earth . EOP provide the rotational transform from the International Terrestrial Reference System (ITRS) to the International Celestial Reference System (ICRS), or vice versa, as a function of time. Earth's rotational velocity is not ...

  9. A potentially habitable Earth-size planet was ... - AOL

    www.aol.com/news/potentially-habitable-earth...

    The planet is about the size of Venus, so slightly smaller than Earth, and may be temperate enough to support life, the researchers said. Dubbed Gliese 12 b, the planet takes 12.8 days to orbit a ...