# Nautical Miles to Light-years (nmi to ly)

Source: https://www.unitconvertercalculator.com/length/nautical-miles-to-light-years/

**1 nmi = 1.9575655446136E-13 ly**

One nautical mile equals approximately 1.958 x 10-13 light-years. A light-year contains about 5.108 trillion nautical miles. The NM measures Earth's sea and air routes; the light-year measures the gaps between stars.

## Formula

Convert Nautical Miles to Light-years

## Conversion Table

| Nautical Miles (nmi) | Light-years (ly) |
|---|---|
| 1 nmi | 1.9575655E-13 ly |
| 100 nmi | 1.957565544E-11 ly |
| 10000 nmi | 1.95756554461E-9 ly |
| 1000000 nmi | 1.9575655446135E-7 ly |
| 100000000 nmi | 1.9575655446136E-5 ly |
| 10000000000 nmi | 0.0019575655446136 ly |
| 1000000000000 nmi | 0.19575655446136 ly |

## Units

### Nautical Mile (nmi)

Exactly 1852 meters by international agreement. Based on one minute of arc of latitude at the Earth's surface. The standard unit for maritime and air navigation.

### Light-year (ly)

The distance light travels in one Julian year (365.25 days) in vacuum. Exactly 9,460,730,472,580,800 meters. Used for interstellar distances.

## Background

The nearest star is about 21.66 trillion NM away (4.24 light-years). Light travels about 161,875 NM per second. A circumnavigation (21,600 NM) is about 4.23 x 10-9 light-years - a billionth of a stellar gap.

## Good to Know

The nautical mile was humanity's first precision distance unit for travel: 1 arcminute of latitude = 1 NM. The light-year is humanity's most dramatic distance unit: the distance light travels in a year. Between them lies the entire history of human ambition to measure farther and farther from shore.

## FAQ

### How many light-years is 1 nautical mile?

One nautical mile equals approximately 1.958 x 10-13 light-years.

### How many NM are in 1 light-year?

One light-year contains approximately 5.108 x 1012 NM (about 5.1 trillion).

### How fast does light travel in knots?

About 582,750,000 knots (NM/hour). That is about 583 million knots.

## Non-Frequently Asked Questions

### How many circumnavigations equal 1 light-year?

Earth's circumference is 21,600 NM. 1 light-year is 5.108 trillion NM. That is about 236 million laps. If Magellan's crew circumnavigated once every 3 years, they would need 709 million years. The crew would not enjoy this assignment.

### If every NM ever sailed were added up, would it reach a star?

Humanity has probably sailed about 100 trillion NM total in maritime history. 1 light-year is 5.1 trillion NM. So all sailing in human history equals about 19.6 light-years - enough to reach several nearby stars including Procyon. Collectively, humanity has sailed to the stars. Just not in the same direction.

### How many knots is light-speed?

About 583 million knots. The fastest ship ever (USS Enterprise at trials) made about 35 knots. Light is 16.6 million times faster. If the Enterprise accelerated by 1 knot per year, it would reach light-speed in 583 million years. Warp drive is not optional.

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## See Also

- [Light-years to Nautical Miles](https://www.unitconvertercalculator.com/length/light-years-to-nautical-miles/)