Light-hours to Miles (lh to mi)

1 light-hour equals 670,616,629.4 miles (rounded).

1 light-hour = 670,616,629.4 miles

How to convert light-hours to miles

To convert light-hours to miles, multiply the number of light-hours by 670,616,629.4. The factor is rounded to 10 significant digits. To go the other way, multiply miles by 1.491164931×10⁻⁹ (rounded).

miles = light-hours × 670,616,629.4

Example: 10 light-hours = 6,706,166,294 miles.

About these units

Light-hour (lh)

AstronomicalCurrent unit

The distance light travels in an hour (about 1.08 billion km). Pluto is about 4.8 light-hours from the Sun.

Reaching the outer planets takes light hours rather than minutes, and the light-hour is the matching unit. Equal to 3,600 light-seconds, it is exactly 1,079,252,848,800 meters, or about 1.08 billion kilometers. Like the other light-time units it is informal, defined entirely by the fixed speed of light and the length of the SI second rather than by any standards body, and it appears mainly in astronomy outreach and in descriptions of deep-space missions.

Neptune orbits at about 30 astronomical units, which with light taking roughly 499 seconds per unit works out to somewhat over four light-hours. Pluto, at an average of 34.72 astronomical units, is about 4.81 light-hours from the Sun. The Voyager 1 probe passed 23 light-hours from Earth and the Sun by 2025 and is expected to reach one light-day, 24 light-hours, around late 2026. Beyond that scale the light-day, light-week and light-year take over.

1 light-hour = 1,079,252,848,800 meters (exactly).

Sources: Wikipedia: Light-hour; Wikipedia: Light-minute; Wikipedia: Astronomical unit

Mile (mi)

US & ImperialCurrent unit

5,280 feet or 1,760 yards, exactly 1,609.344 meters. This is the statute (international) mile used on US and UK roads.

A thousand paces gave the mile its name. It descends from the Latin mille passus, the Roman mile, by way of Old English mil and Middle English myle. For centuries after Rome, miles of many lengths coexisted; a sixteenth-century Mercator map, for example, shows small, medium and large Flemish miles on a single scale bar. The English statute mile was fixed by an Act of Parliament under Elizabeth I in 1593, which declared that a mile contains eight furlongs, or 5,280 feet.

The 1959 international yard and pound agreement made that mile exactly 1,609.344 meters. A slightly longer US survey mile, about 1,609.347 meters, lingered in American land surveys and was slated for retirement from 1 January 2023. Today the mile is the road unit of the United Kingdom, the United States, Liberia and Myanmar, along with several territories such as the Bahamas, Belize, Guam and the US Virgin Islands. In Canada it survives chiefly in rail transport and horse racing.

1 mile = 1,609.344 meters (exactly).

Sources: Wikipedia: Mile; Wikipedia: Foot (unit); NIST Guide to the SI, Appendix B.8: conversion factors

Related conversions

See all length units.