REFERENCE DATA USED FOR COMPUTATIONS ON THIS WEB SITE | |
Values marked with ** are EXACT values and with * are adopted standards. | |
Speed of Light |
299792458 m/s ** (NIST) 299792.458 km/s 186282.397 mi/s 670616629.384 mi/h 1079252848.800 km/h |
1 Foot (ft) | 0.3048 m ** |
1 Statute Mile (mi) |
5280 ft ** 1760 yd 1609.344 m 1.609344 km 0.8689762419006479 nmi |
1 Kilometer (km) |
1000 m ** 0.621371192237334 mi 3280.8398950131233596 ft 1093.6132983377077865 yd |
1 Nautical Mile (nmi) |
1852 m ** 1.852 km 1.1507794480235425 mi 2025.3718285214348206 yd 6076.1154855643044619 ft |
1 Astronomical Unit (AU) |
149597870.700 km * (IAU/NASA/JPL DE430) 92955807.273 mi |
Light Time To Span 1 AU |
499.004784 seconds 8 minutes and 19.004784 seconds 0.005775518331436996 day |
Solar Radius | 695508 km ±26 432169 mi ±16 |
Earth Radius |
6356.7519 km (Polar) 3949.9025 mi 6367.4443 km (Mean) 3956.5464 mi 6378.1366 km (Equatorial) 3963.1903 mi flattening = f = 1/298.257 = 0.003352813178 (1 − f) = 0.996647186822 |
Lunar Radius |
1736.0 km (Polar) 1078.70 mi 1737.05 km (Mean) 1079.35 mi 1738.1 km (Equatorial) 1080.00 mi |
Geocentric Lunar Distance |
363301 km (Min = Perigee) 225745 mi 384401 km (Mean) 238856 mi 405502 km (Max = Apogee) 251967 mi |
Horizontal Parallax At 1 AU |
8.79415" 0.0024428194444444° |
Standard Julian Year |
365.25 days ** 365 days and 6 hours 8766 hours 525960 minutes 31557600 seconds |
Standard Gregorian Year |
365.2425 days ** 365 days 5 hrs 49 min and 12 sec 8765.82 hours 525949.2 minutes 31556952 seconds |
1 Light Year (LY) | 9460730472580.8 km 5878625373183.6 mi 63241.0770880709446742 AU 0.3066013952202032 pc |
1 Parsec (pc) |
30856775670468 km 206264.80624709635488 AU 3.2615637619058885 LY |
Standard Earth Gravity |
9.80665 m/s2 * 1.000 G * 32.17405 ft/s2 |
Newtonian Constant Of Gravitation |
0.0000000000667428 m3/kg/s2 |
Stefan-Boltzmann Radiation Constant (σ) |
0.000000056704 W/m2/s/T4 |
Physical Constants - NIST Planetary Fact Sheets - NASA | |
Jay Tanner - 2016 |