Volume X: Appendices — Chapter 3: Physical Constants
"Everything is measured. Everything measured is understood. Everything understood is controllable."
— Academy of Sciences, motto, +850 Y.E.
Related sections: → see [Volume I, Ch.02, "Star Khar'Vex"], → see [Volume I, Ch.03, "Planet Théxar"], → see [Volume IV, Ch.09, "The Senary System"]
Surveying the mountain pass3.1 Fundamental Constants
| Symbol |
Name |
Value (SI) |
Xha'Ruun designation |
| c |
Speed of light |
299,792,458 m/s |
khar-thar-morel |
| G |
Gravitational constant |
6.674×10⁻¹¹ m³/(kg·s²) |
thal-ven |
| ℏ |
Planck constant |
1.055×10⁻³⁴ J·s |
morin-thar |
| kB |
Boltzmann constant |
1.381×10⁻²³ J/K |
thar-en-in |
| e |
Elementary charge |
1.602×10⁻¹⁹ C |
thar-in |
| me |
Electron mass |
9.109×10⁻³¹ kg |
xa-in-torin |
| mp |
Proton mass |
1.673×10⁻²⁷ kg |
xa-in-tor |
| α |
Fine-structure constant |
1/137.036 |
ven-el-sha |
3.2 Parameters of Planet Théxar
| Parameter | Value |
|---|
| Mass | 5.3172 × 10²⁴ kg |
| Mean radius | 6,112 km |
| Nominal surface gravity | 9.5 m/s² |
| Mean density | 5,559.6 kg/m³ |
| Escape speed from nominal surface | 10.78 km/s |
| Albedo | 0.31 |
| Solar day | 27.3 Earth hours = 98,280 s |
| Obliquity | 14.2° |
| Mean year | 178.2 local days = 202.7025 Earth days |
3.3 Parameters of Star Khar'Vex
| Parameter | Value |
|---|
| Class | K2V |
| Mass | 0.82 M☉ |
| Radius | 0.78 R☉ |
| Luminosity | 0.41 L☉ |
| Age | 6.5 billion Julian years |
3.4 Orbital Parameters
| Parameter | Value |
|---|
| Semimajor axis | 0.63209 AU ≈ 94.559 million km |
| Eccentricity | 0.018 |
| Mean period | 178.2 local days |
| Mean motion | 2π per orbital period |
3.5 Moons: Serrin and Thel
| Satellite | Description |
|---|
| Serrin | Large silicate moon; scientific base. |
| Thel | Small dark moon; helium-3 extraction. |
3.6 Senary System of Measures (base)
| Unit | Value | Quantity |
|---|
| sha | 0.82 m | Length |
| mo | 8,200 m = 10,000 sha | Length |
| mig | 1 s | Time |
| tyazh | 101,325 Pa | Pressure |
3.7 Conversion to SI
| Parameter | Value |
|---|
| Ordinary year | 6 × 29 + 4 = 178 local days |
| Long year | 179 local days in years divisible by five |
| Era origin | Year 0 |
Chapter Summary
