Centimeters to Light-hours (cm to lh)
1 centimeter equals 9.265669311×10⁻¹⁵ light-hours (rounded).
How to convert centimeters to light-hours
To convert centimeters to light-hours, multiply the number of centimeters by 9.265669311×10⁻¹⁵. The factor is rounded to 10 significant digits. To go the other way, multiply light-hours by 107,925,284,880,000.
light-hours = centimeters × 9.265669311×10⁻¹⁵
Example: 10 centimeters = 9.265669311×10⁻¹⁴ light-hours.
About these units
Centimeter (cm)
One hundredth of a meter. Used for body measurements, clothing and everyday objects.
Scientists, rather than shopkeepers, gave the centimeter its place. In 1832 Carl Friedrich Gauss proposed a system of absolute units built on length, mass and time, choosing the millimeter, milligram and second. In 1873 a committee of the British Association for the Advancement of Science, whose members included James Clerk Maxwell and William Thomson (Lord Kelvin), recommended the centimeter, gram and second instead. That CGS system dominated physics for decades, until the metre-kilogram-second system replaced it in the mid-twentieth century and led to SI.
CGS units proved awkward for rooms and buildings, which run to hundreds of centimeters, but the centimeter itself never went away. It is still the everyday unit for height, clothing and small objects, and it appears in map scales and rainfall reports. An adult fingernail is roughly one centimeter wide, and a milliliter is defined as exactly one cubic centimeter. An inch is exactly 2.54 centimeters. The CGS system itself survives mainly in theoretical physics and astrophysics, where Gaussian units are still common.
1 centimeter = 0.01 meters (exactly).
Sources: Wikipedia: Centimetre-gram-second system of units; Wikipedia: Centimetre; NIST Guide to the SI, Appendix B.8: conversion factors
Light-hour (lh)
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
Related conversions
- Light-hours to centimeters (reverse)
- Centimeters to meters
- Centimeters to kilometers
- Centimeters to millimeters
- Centimeters to inches
- Centimeters to feet
- Centimeters to yards
- Centimeters to miles
- Centimeters to micrometers
- Centimeters to nanometers
- Centimeters to nautical miles
- Centimeters to pixels (CSS)
- Centimeters to light-years
- Meters to light-hours
- Kilometers to light-hours
- Millimeters to light-hours
- Inches to light-hours
- Feet to light-hours
- Yards to light-hours
- Miles to light-hours
See all length units.