Gyrd

Compared to real-life Earth, Gyrd is, like real-life Earth, an oblate spheroid in shape, but Gyrd is larger in size, but not as dense, than real-life Earth.

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Gyrd's mean radius is 10,200 kilometers at Gyrd's mean sea level, or slightly more than 1.6 times the mean radius of real-life Earth. Gyrd's polar radius is approximately 10,145 kilometers, and its equatorial radius is approximately 10,255 kilometers. This gives Gyrd a flattening of slightly more than 0.0107, or approximately 3.2 times as much as that of real-life Earth. Since Gyrd's polar and equatorial radii are known, Gyrd's polar circumference, equatorial circumference, volume, surface area can be calculated. Gyrd's polar circumference is approximately 63,742.9 kilometers, and Gyrd's equatorial circumference is approximately 64,434.1 kilometers. Gyrd's total surface area at mean sea level is slightly less than 1,312,102,550 square kilometers, or roughly 2.6 times as much surface area as real-life Earth. Gyrd's total volume at mean sea level is slightly more than 4,469,016,828,807 cubic kilometers, or slightly more than 4.125 times as much as that of real-life Earth.

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It should be noted that neither mass or density is the same concept as volume, although the concepts are related to each other, as density is the amount of mass per unit of volume. Gyrd is noticeably less dense than real-life Earth: Gyrd's mean density is approximately 4.05 grams per cubic centimeter, which is considerably less dense than real-life Earth but slightly more dense than real-life Mars. This means that Gyrd's mass is roughly 1.81*(10^25) kilograms, or roughly three times as much mass as real-life Earth. While a person on Gyrd would have the same mass that he/she has on real-life Earth, he/she would weigh more on Gyrd than on real-life Earth due to Gyrd having a stronger surface gravity than real-life Earth. As Gyrd's surface gravity can be estimated by dividing its mass as a multiple of earth's mass by the square of its mean radius as a multiple of earth's radius, Gyrd's surface gravity is approximately 1.172 times that of real-life Earth, or approximately 11.493 meters per second squared, meaning that a person who weighs 100 kilograms on real-life Earth would weigh approximately 117.2 kilograms on Gyrd.