Convert length and distance units — meters, feet, inches, kilometers, miles, light years and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 au | 80777.5 nmi | |
| 0.01 au | 807775 nmi | |
| 0.1 au | 8.07775e+06 nmi | |
| 1 au | 8.07775e+07 nmi | |
| 5 au | 4.03888e+08 nmi | |
| 10 au | 8.07775e+08 nmi | |
| 50 au | 4.03888e+09 nmi | |
| 100 au | 8.07775e+09 nmi | |
| 1000 au | 8.07775e+10 nmi |
Multiply the number of Astronomical Units by 80777500 to get Nautical Miles. Formula: nmi = au × 80777500. Example: 10 au × 80777500 = 807775000 nmi. To reverse, divide Nautical Miles by 80777500 to get Astronomical Units.
| Astronomical Unit (au) | Nautical Mile (nmi) |
|---|---|
| 0.001 au | 80777.5 nmi |
| 0.01 au | 807775 nmi |
| 0.1 au | 8077750 nmi |
| 0.5 au | 40388800 nmi |
| 1 au | 80777500 nmi |
| 2 au | 161555000 nmi |
| 5 au | 403888000 nmi |
| 10 au | 807775000 nmi |
| 20 au | 1615550000 nmi |
| 50 au | 4038880000 nmi |
| 100 au | 8077750000 nmi |
| 250 au | 20194400000 nmi |
| 500 au | 40388800000 nmi |
| 1000 au | 80777500000 nmi |
| 10000 au | 807775000000 nmi |
To convert Astronomical Unit to Nautical Mile, multiply by 80777500. Example: 10 au = 807775000 nmi
To convert Nautical Mile back to Astronomical Unit, divide by 80777500 (multiply by 1.238×10-8). Use the swap button above.
Start with 100 Astronomical Units = 8077750000 nmi as your reference point. Scale up or down from there.
Maritime navigation instructors teaching celestial navigation bridge the gap between nautical miles (operational unit at sea) and AU (unit of celestial mechanics) when explaining how star positions relate to navigation.
Satellites monitoring maritime traffic operate at orbital altitudes in AU (fractions), while their sensors track ship positions measured in nautical miles — both units appear in system performance specifications.
1 AU = 80.78 million nautical miles. Science communicators use this to make the Earth-Sun distance tangible for maritime audiences: "the distance to the Sun in the same units sailors use to navigate the oceans."
Interdisciplinary scientists studying solar radiation's effect on ocean circulation work in AU for solar distance and nautical miles for ocean basin scale — conversion needed when writing cross-disciplinary publications.
The nautical mile was defined in relation to Earth's circumference — a terrestrial measurement. Comparing it to the AU, defined by Earth's orbit, illustrates how both units ultimately derive from our planet's geometry.
Legal and technical documents governing maritime zones and satellite coverage areas may reference both nautical miles (for territorial waters) and AU (for orbital parameters) requiring consistent cross-scale conversion.
The Astronomical Unit is a unit of Length measurement (symbol: au). 1 au = 80777500 nmi. Used in scientific and practical Length measurement applications.
The Nautical Mile is a unit of Length measurement (symbol: nmi). It is part of an internationally recognised measurement system used alongside the Astronomical Unit.
The astronomical unit has ancient roots — Aristarchus of Samos attempted to measure the Earth-Sun distance around 270 BC, estimating it at 18–20 lunar distances (the true value is about 390). For centuries the AU was estimated using Venus transit observations and trigonometry. Edmond Halley organised the first coordinated international transit-of-Venus expedition in 1716. The modern value was determined by radar ranging to Venus in 1961. The IAU formally defined the AU as exactly 149,597,870,700 metres in 2012 — a fixed constant of physics, not a measured distance.
The nautical mile was defined by its relationship to Earth's geography — one minute of arc of latitude along a meridian, approximately 1,852 metres. This made it ideal for navigation: on a nautical chart, one nautical mile equals one arcminute, allowing direct distance measurement with dividers. The International Hydrographic Conference standardised it at exactly 1,852 metres in 1929. Today it is universally used in maritime and aviation navigation — the only two domains that never adopted kilometres for operational distances.
Common use: Astronomical Unit to Nautical Mile conversion is needed when working with international standards, scientific publications, or reference materials that use different unit systems for Length measurement.