Light-days to astronomical units
Type a value in ld to get it in AU instantly.
173.1AU
That's 1.04× as far as Voyager 1, while Proxima Centauri is 1,552× farther.
What it means
How far is that?
Light in vacuum: 299,792.458 km/s, exact by definition. Planet distances change with orbits; references are typical.
The math
How to convert ld to AU
To convert light-days to astronomical units, multiply by 173.145.
Example: 1 ld × 173.145 = 173.145 AU.
In the other direction, 1 AU = 0.00577552 ld.
Every unit
That distance in every unit
Tables
ld to AU conversion table
| ld | AU |
|---|---|
| 0.1 ld | 17.3145 AU |
| 0.5 ld | 86.5723 AU |
| 1 ld | 173.145 AU |
| 2 ld | 346.289 AU |
| 3 ld | 519.434 AU |
| 5 ld | 865.723 AU |
| 8.3 ld | 1,437.1 AU |
| 10 ld | 1,731.45 AU |
| 12.5 ld | 2,164.31 AU |
| 20 ld | 3,462.89 AU |
| 30 ld | 5,194.34 AU |
| 43 ld | 7,445.22 AU |
| 60 ld | 10,388.7 AU |
| 250 ld | 43,286.2 AU |
AU to ld conversion table
| AU | ld |
|---|---|
| 0.1 AU | 0.000577552 ld |
| 0.5 AU | 0.00288776 ld |
| 1 AU | 0.00577552 ld |
| 2 AU | 0.011551 ld |
| 3 AU | 0.0173266 ld |
| 5 AU | 0.0288776 ld |
| 8.3 AU | 0.0479368 ld |
| 10 AU | 0.0577552 ld |
| 12.5 AU | 0.072194 ld |
| 20 AU | 0.11551 ld |
| 30 AU | 0.173266 ld |
| 43 AU | 0.248347 ld |
| 60 AU | 0.346531 ld |
| 250 AU | 1.44388 ld |
Quick answers
Quick answers
- How many AU is 1 ld?
- 1 ld is 173.145 AU.
- How many AU is 10 ld?
- 10 ld is 1,731.45 AU.
The units
About these units
Light-days (ld)
Distance light travels in one day.
Astronomical units (AU)
Mean Earth–Sun distance.
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