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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. Figure of the Earth - Wikipedia

   en.wikipedia.org/wiki/Figure_of_the_Earth

   The curvature of the Earth is evident in the horizon across the image, and the bases of the buildings on the far shore are below that horizon and hidden by the sea. The simplest model for the shape of the entire Earth is a sphere. The Earth's radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). While "radius ...

4. List of common astronomy symbols - Wikipedia

   en.wikipedia.org/wiki/List_of_common_astronomy...

   Orbital Parameters of a Cosmic Object: . α - RA, right ascension, if the Greek letter does not appear, á letter will appear. δ - Dec, declination, if the Greek letter does not appear, ä letter will appear.

5. Mean radius (astronomy) - Wikipedia

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

   For planet Earth, which can be approximated as an oblate spheroid with radii 6 378.1 km and 6 356.8 km, the mean radius is = (( ) ) / = . The equatorial and polar radii of a planet are often denoted r e {\displaystyle r_{e}} and r p {\displaystyle r_{p}} , respectively.

6. Geodetic coordinates - Wikipedia

   en.wikipedia.org/wiki/Geodetic_coordinates

   Geodetic latitude and geocentric latitude have different definitions. Geodetic latitude is defined as the angle between the equatorial plane and the surface normal at a point on the ellipsoid, whereas geocentric latitude is defined as the angle between the equatorial plane and a radial line connecting the centre of the ellipsoid to a point on the surface (see figure).

7. Watchdog raises concerns over Trump-era leak probes of ... - AOL

   www.aol.com/watchdog-raises-concerns-over-trump...

   A top government watchdog raised concerns Tuesday over the handling of leak investigations during the first Trump administration that targeted members of Congress and the media despite finding no ...

8. Gravity of Earth - Wikipedia

   en.wikipedia.org/wiki/Gravity_of_Earth

   The gravity g′ at depth d is given by g′ = g(1 − d/R) where g is acceleration due to gravity on the surface of the Earth, d is depth and R is the radius of the Earth. If the density decreased linearly with increasing radius from a density ρ 0 at the center to ρ 1 at the surface, then ρ(r) = ρ 0 − (ρ 0 − ρ 1) r / R, and the ...

9. A Visual Guide to Monarch Butterflies - AOL

   www.aol.com/visual-guide-monarch-butterflies...

   If you’re looking to take a deep dive into the monarch butterfly, be sure to check out our free monarch butterfly lesson plan, which can be downloaded and used to guide teaching or simply to ...