| astronomical unit | 1 AU | 2 AU | 3 AU | 4 AU | 5 AU | 6 AU | 7 AU | 8 AU | 9 AU | 10 AU | 11 AU | 12 AU | 13 AU | 14 AU | 15 AU | 16 AU | 17 AU | 18 AU | 19 AU | 20 AU | 21 AU | 22 AU | 23 AU | 24 AU | 25 AU | 26 AU | 27 AU | 28 AU | 29 AU | 30 AU | 31 AU | 32 AU | 33 AU | 34 AU | 35 AU | 36 AU | 37 AU | 38 AU | 39 AU | 40 AU | 41 AU | 42 AU | 43 AU | 44 AU | 45 AU | 46 AU | 47 AU | 48 AU | 49 AU | 50 AU | 51 AU | 52 AU | 53 AU | 54 AU | 55 AU | 56 AU | 57 AU | 58 AU | 59 AU | 60 AU | 61 AU | 62 AU | 63 AU | 64 AU | 65 AU | 66 AU | 67 AU | 68 AU | 69 AU | 70 AU | 71 AU | 72 AU | 73 AU | 74 AU | 75 AU | 76 AU | 77 AU | 78 AU | 79 AU | 80 AU | 81 AU | 82 AU | 83 AU | 84 AU | 85 AU | 86 AU | 87 AU | 88 AU | 89 AU | 90 AU | 91 AU | 92 AU | 93 AU | 94 AU | 95 AU | 96 AU | 97 AU | 98 AU | 99 AU | 100 AU |
| millimeter | 1.495978707 × 1014 mm | 2.991957414 × 1014 mm | 4.487936121 × 1014 mm | 5.983914828 × 1014 mm | 7.479893535 × 1014 mm | 8.975872242 × 1014 mm | 1.0471850949 × 1015 mm | 1.1967829656 × 1015 mm | 1.3463808363 × 1015 mm | 1.495978707 × 1015 mm | 1.6455765777 × 1015 mm | 1.7951744484 × 1015 mm | 1.9447723191 × 1015 mm | 2.0943701898 × 1015 mm | 2.2439680605 × 1015 mm | 2.3935659312 × 1015 mm | 2.5431638019 × 1015 mm | 2.6927616726 × 1015 mm | 2.8423595433 × 1015 mm | 2.991957414 × 1015 mm | 3.1415552847 × 1015 mm | 3.2911531554 × 1015 mm | 3.4407510261 × 1015 mm | 3.5903488968 × 1015 mm | 3.7399467675 × 1015 mm | 3.8895446382 × 1015 mm | 4.0391425089 × 1015 mm | 4.1887403796 × 1015 mm | 4.3383382503 × 1015 mm | 4.487936121 × 1015 mm | 4.6375339917 × 1015 mm | 4.7871318624 × 1015 mm | 4.9367297331 × 1015 mm | 5.0863276038 × 1015 mm | 5.2359254745 × 1015 mm | 5.3855233452 × 1015 mm | 5.5351212159 × 1015 mm | 5.6847190866 × 1015 mm | 5.8343169573 × 1015 mm | 5.983914828 × 1015 mm | 6.1335126987 × 1015 mm | 6.2831105694 × 1015 mm | 6.4327084401 × 1015 mm | 6.5823063108 × 1015 mm | 6.7319041815 × 1015 mm | 6.8815020522 × 1015 mm | 7.0310999229 × 1015 mm | 7.1806977936 × 1015 mm | 7.3302956643 × 1015 mm | 7.479893535 × 1015 mm | 7.6294914057 × 1015 mm | 7.7790892764 × 1015 mm | 7.9286871471 × 1015 mm | 8.0782850178 × 1015 mm | 8.2278828885 × 1015 mm | 8.3774807592 × 1015 mm | 8.5270786299 × 1015 mm | 8.6766765006 × 1015 mm | 8.8262743713 × 1015 mm | 8.975872242 × 1015 mm | 9.1254701127 × 1015 mm | 9.2750679834 × 1015 mm | 9.4246658541 × 1015 mm | 9.5742637248 × 1015 mm | 9.7238615955 × 1015 mm | 9.8734594662 × 1015 mm | 1.00230573369 × 1016 mm | 1.01726552076 × 1016 mm | 1.03222530783 × 1016 mm | 1.0471850949 × 1016 mm | 1.06214488197 × 1016 mm | 1.07710466904 × 1016 mm | 1.09206445611 × 1016 mm | 1.10702424318 × 1016 mm | 1.12198403025 × 1016 mm | 1.13694381732 × 1016 mm | 1.15190360439 × 1016 mm | 1.16686339146 × 1016 mm | 1.18182317853 × 1016 mm | 1.1967829656 × 1016 mm | 1.21174275267 × 1016 mm | 1.22670253974 × 1016 mm | 1.24166232681 × 1016 mm | 1.25662211388 × 1016 mm | 1.27158190095 × 1016 mm | 1.28654168802 × 1016 mm | 1.30150147509 × 1016 mm | 1.31646126216 × 1016 mm | 1.33142104923 × 1016 mm | 1.3463808363 × 1016 mm | 1.36134062337 × 1016 mm | 1.37630041044 × 1016 mm | 1.39126019751 × 1016 mm | 1.40621998458 × 1016 mm | 1.42117977165 × 1016 mm | 1.43613955872 × 1016 mm | 1.45109934579 × 1016 mm | 1.46605913286 × 1016 mm | 1.48101891993 × 1016 mm | 1.495978707 × 1016 mm |
The astronomical unit (symbol: au or ua) is a unit of length, roughly the distance from Earth to the Sun. However, that distance varies as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 149 597 870 700 metres (about 150 million kilometres, or 93 million miles). The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. However, it is also a fundamental component in the definition of another unit of astronomical length, the parsec.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| astronomical unit | AU | ≡ 149 597 870 700 m ≈ Distance from Earth to Sun | ≡ 149 597 870 700 m | Science - Astronomy (Length) |
| astronomical units | millimeters | astronomical units | millimeters |
|---|---|---|---|
| 1 | ≡ 1.495978707E+14 | 4 | ≡ 5.983914828E+14 |
| 1.5 | ≡ 2.2439680605E+14 | 4.5 | ≡ 6.7319041815E+14 |
| 2 | ≡ 2.991957414E+14 | 5 | ≡ 7.479893535E+14 |
| 2.5 | ≡ 3.7399467675E+14 | 5.5 | ≡ 8.2278828885E+14 |
| 3 | ≡ 4.487936121E+14 | 6 | ≡ 8.975872242E+14 |
The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length. Therefore there are thousand millimetres in a metre. There are ten millimetres in a centimetre.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| millimeter | mm | ≡ 1×10-3 m ≡ 0.001 m | ≡ 1×10-3 m ≡ 0.001 m | Metric system SI |
| millimeters | astronomical units | millimeters | astronomical units |
|---|---|---|---|
| 1 | ≡ 6.6845871222684E-15 | 4 | ≡ 2.6738348489074E-14 |
| 1.5 | ≡ 1.0026880683403E-14 | 4.5 | ≡ 3.0080642050208E-14 |
| 2 | ≡ 1.3369174244537E-14 | 5 | ≡ 3.3422935611342E-14 |
| 2.5 | ≡ 1.6711467805671E-14 | 5.5 | ≡ 3.6765229172476E-14 |
| 3 | ≡ 2.0053761366805E-14 | 6 | ≡ 4.0107522733611E-14 |
| astronomical units | millimeters |
|---|---|
| 1 | ≡ 1.495978707 × 1014 |
| 6.6845871222684 × 10-15 | ≡ 1 |
You can find the conversion in other languages in the following:
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |