Descriptions

Abbreviations

Adjusted values

Earth Mean density

ρ ¯

5.515 g/cm3 [53]

Distance value that light travel along one year

Distance Light 1 year

9.460730472 × 1012 km [53]

1Parsec in miles

1 Pc inmiles

19.174 Trillion miles = 1.9174 × 1013 miles [53]

1Parsec in light year

1 Pc inlightyear

3.261633 Light year [53]

Standard gravity of earth

g 0

980.665 cm/s2 ≅ 9.80665 m/s2 [56]

Thickness of homosphere

T H

80 - 100 km [57] [66]

1Parsec in km

1 Pc inkm

30.8567758149137 trillion kilometers [58] ≅ 3.0856776 × 1016 meters [53]

Sidereal rotation period

SRP

0.99726968 d (23 h 56 m 4.100 s) [53] [58]

Equatorial diameter

D earth Equatorial

12,756.2732 km ≅ 12,756.274 [50] [59]

Equatorial radius

R EQUATOR

6,378,136.6 ± 0.1 m [50] [59] = 6,378.1366 km = 6.3781366 × 106 m [60] ≅ 6,378,137 m [50] [59]

Speed of light

C

299,792.458 ms−1 = 2.99792458 × 108 ms−1 [48] [50] [51] [52] [60]

Earth density

E D

5.514 gr/cm3 [54] [61]

Volume percent of helium gas in dry atmosphere

V P Heliumgas dryatm .

0.000524% = 5.24e−4%

5.2 parts per million [62] [63]

Volume percent of xenon gas in dry atmosphere

V P Xenongas dryatm .

0.0000087% Percent by volume

87 ± 1 parts per billion (nL/L) [64]

Diameter of earth

D earth

12,742 km [65]

Earth radius (Mean radius)

R

6,371 km (3958.8 mi) [65]

Earth’s orbital inclination to sun’s equator

O I tosun sequator

7.155˚ [66]

Age of the primordial earth

AOE

4.54 billion years 4.54 ± 0.04 Gya [67] [68] [69] [70]