The earth is a tad wider 41 km than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like)

Discovery : Date of Discovery : Unknown, Discovered By : Known by the Ancients

Orbit Size
Around Sun : 149,598,262 km
Scientific Notation: 1.4959826 x 108 km
Astronomical Units: 1.000 A.U.

Mean Orbit Velocity
107,218 km/h
Scientific Notation: 2.9783 x 104 m/s

Orbit Eccentricity
0.01671123

Equatorial Inclination
23.4393 degrees

Equatorial Radius
6,371.00 km
Scientific Notation: 6.3710 x 103 km

Equatorial Circumference
40,030.2 km
Scientific Notation: 4.00302 x 104 km

Volume
1,083,206,916,846 km3
Scientific Notation: 1.08321 x 1012 km3

Mass
5,972,190,000,000,000,000,000,000 kg
Scientific Notation: 5.9722 x 1024 kg

Density
5.513 g/cm3

Surface Area
510,064,472 km2
Scientific Notation: 5.1006 x 108 km2

Surface Gravity
9.80665 m/s2

Escape Velocity
40,284 km/h
Scientific Notation: 1.119 x 104 m/s

Sidereal Rotation Period
0.99726968 Earth Days
23.934 Hours

Surface Temperature
-88/58 (min/max) °C
Scientific Notation: 185/331 (min/max) K

Atmospheric Constituents
Nitrogen, Oxygen
Scientific Notation: N2, O2
By Comparison: N2 is 80% of Earth's air and is a crucial element in DNA.

What is the diameter of the earth?
The diameter of the earth at the equator is 12,756.32 kilometers.
If you measure the earth through the poles the diameter is a bit shorter 12,715.43 km.