lunar distance
A lunar distance is the mean centre-to-centre separation of the Earth and the Moon, 384,399 kilometres. It is the standard yardstick for reporting near-Earth asteroid encounters: a rock passing at 0.5 LD passed inside the Moon's orbit, which is the threshold at which the public notices.
Watch out: It is a mean, not a constant. The Moon's orbit is elliptical, running from about 356,500 km at perigee to 406,700 km at apogee, a spread of 13%, and it recedes about 3.8 cm per year. The value here is the conventional mean semi-major axis.
| 1 | 384,399,000 |
One lunar distance in every length unit
| 2.37833e+43 | Planck length (lP) | |
| 3.84399e+23 | femtometer (fm) | |
| 3.84399e+20 | picometer (pm) | |
| 7.26409e+18 | bohr radius (a0) | |
| 3.84399e+18 | angstrom (Å) | |
| 3.84399e+17 | nanometer (nm) | |
| 384,399,000,000,000 | micrometer (μm) | |
| 15,133,800,000,000 | thou (thou) | |
| 1,089,630,000,000 | point (pt) | |
| 384,399,000,000 | millimeter (mm) | |
| 90,802,900,000 | pica (pc) | |
| 38,439,900,000 | centimeter (cm) | |
| 15,133,800,000 | inch (in) | |
| 3,843,990,000 | decimeter (dm) | |
| 3,783,450,000 | hand (hh) | |
| 1,910,840,000 | link (li) | |
| 1,261,150,000 | foot (ft) | |
| 1,261,150,000 | US survey foot (ftUS) | |
| 420,384,000 | yard (yd) | |
| 384,399,000 | meter (m) | |
| 210,192,000 | fathom (ftm) | |
| 76,433,400 | rod (rd) | |
| 19,108,400 | chain (ch) | |
| 2,075,590 | cable length (cb) | |
| 1,910,840 | furlong (fur) | |
| 384,399 | kilometer (km) | |
| 238,854 | mile (mi) | |
| 207,559 | nautical mile (nmi) | |
| 79,618.2 | league (lea) | |
| 384.399 | megameter (Mm) | |
| 60.3357 | Earth radius (REarth) | |
| 1.28222 | light-second (ls) | |
| 1 | lunar distance (LD)this unit | |
| 0.552536 | solar radius (Rsun) | |
| 0.0213703 | light-minute (lmin) | |
| 0.00256955 | astronomical unit (AU) | |
| 4.06310e-08 | light-year (ly) | |
| 1.24575e-08 | parsec (pc) | |
| 1.24575e-11 | kiloparsec (kpc) | |
| 1.24575e-14 | megaparsec (Mpc) | |
| 1.24575e-17 | gigaparsec (Gpc) |
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