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  2. Earth radius - Wikipedia

    en.wikipedia.org/wiki/Earth_radius

    Earth radius (denoted as R 🜨 or R E) is the distance from the center of Earth to a point on or near its surface. Approximating the figure of Earth by an Earth spheroid (an oblate ellipsoid), the radius ranges from a maximum (equatorial radius, denoted a) of nearly 6,378 km (3,963 mi) to a minimum (polar radius, denoted b) of nearly 6,357 km (3,950 mi).

  3. On the Sizes and Distances (Aristarchus) - Wikipedia

    en.wikipedia.org/wiki/On_the_Sizes_and_Distances...

    Aristarchus's 3rd century BCE calculations on the relative sizes of, from left, the Sun, Earth and Moon, from a 10th-century CE Greek copy. On the Sizes and Distances (of the Sun and Moon) (Ancient Greek: Περὶ μεγεθῶν καὶ ἀποστημάτων [ἡλίου καὶ σελήνης], romanized: Perì megethôn kaì apostēmátōn [hēlíou kaì selḗnēs]) is widely accepted ...

  4. Equatorial bulge - Wikipedia

    en.wikipedia.org/wiki/Equatorial_bulge

    The planet Earth has a rather slight equatorial bulge; its equatorial diameter is about 43 km (27 mi) greater than its polar diameter, with a difference of about 1 ⁄ 298 of the equatorial diameter. If Earth were scaled down to a globe with an equatorial diameter of 1 metre (3.3 ft), that difference would be only 3 mm (0.12 in).

  5. Globe - Wikipedia

    en.wikipedia.org/wiki/Globe

    [1] [2] Many globes are made with a circumference of one metre, so they are models of the Earth at a scale of 1:40 million. In imperial units, many globes are made with a diameter of one foot [citation needed] (about 30 cm), yielding a circumference of 3.14 feet (about 96 cm) and a scale of 1:42 million. Globes are also made in many other sizes.

  6. Middle Schooler's Headaches 'Passed Off as a Virus' Until His ...

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    Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories.

  7. Woman, 103, injured after buck breaks into Michigan ... - AOL

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    (CBS DETROIT) - A 103-year-old woman is recovering after a buck broke into the assisted living facility she's living in. The Blackman-Leoni Department of Public Safety says the incident happened ...

  8. Indiana ban on gender surgery, puberty blockers for minors ...

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    Hanlon’s order had also blocked provisions of the law that would prohibit Indiana doctors from communicating with out-of-state doctors about gender-affirming care for their patients younger than 18.

  9. Equivalent radius - Wikipedia

    en.wikipedia.org/wiki/Equivalent_radius

    This is equivalent to the above definition of the 2D mean diameter. However, for historical reasons, the hydraulic radius is defined as the cross-sectional area of a pipe A , divided by its wetted perimeter P , which leads to D H = 4 R H {\displaystyle D_{\text{H}}=4R_{\mathbb {H} }} , and the hydraulic radius is half of the 2D mean radius.

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