Yards to Light-hours (yd to lh)
1 yard equals 8.472528018×10⁻¹³ light-hours (rounded).
How to convert yards to light-hours
To convert yards to light-hours, multiply the number of yards by 8.472528018×10⁻¹³. The factor is rounded to 10 significant digits. To go the other way, multiply light-hours by 1,180,285,267,717 (rounded).
light-hours = yards × 8.472528018×10⁻¹³
Example: 10 yards = 8.472528018×10⁻¹² light-hours.
About these units
Yard (yd)
3 feet or 36 inches, exactly 0.9144 meters. Used for sports fields, fabric and short distances in the US and UK.
Yard descends from the Old English gerd or gyrd, meaning a branch, stave or measuring rod. It first appears in the late seventh-century laws of Ine of Wessex, though there it names a tax unit, the yardland. Around 959 to 963 King Edgar ordered that the measure held at Winchester be used throughout his realm, the earliest record of a prototype. A story that Henry I fixed the yard as the distance from his nose to his thumb is later folklore, and the true origin, whether pace, cubit or waist, remains speculative.
Britain defined the Imperial Standard Yard in 1824 as the distance between two marks on a brass rod at 62 degrees Fahrenheit. A fire in 1834 damaged the standard, a replacement was made in 1845, and the Weights and Measures Act 1855 recognized it. The 1959 international agreement then fixed the yard at exactly 0.9144 meter. Today it measures American and Canadian football fields, association football pitches and cricket pitches, appears on UK road signs for short distances, and is still used to sell fabric in the US and UK.
1 yard = 0.9144 meters (exactly).
Sources: Wikipedia: Yard; Wikipedia: Inch; 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 yards (reverse)
- Yards to meters
- Yards to kilometers
- Yards to centimeters
- Yards to millimeters
- Yards to inches
- Yards to feet
- Yards to miles
- Yards to micrometers
- Yards to nanometers
- Yards to nautical miles
- Yards to pixels (CSS)
- Yards to light-years
- Meters to light-hours
- Kilometers to light-hours
- Centimeters to light-hours
- Millimeters to light-hours
- Inches to light-hours
- Feet to light-hours
- Miles to light-hours
See all length units.