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Light-Year Distance and Travel-Time Converter — result sheet
Convert a distance in light-years to metres, kilometres, astronomical units, parsecs, and the corresponding light-travel time.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: One light-year = c × one Julian year = 9.4607304725808 × 10¹⁵ m; travel time at c equals the entered number of years.
A light-year is a distance defined by how far light travels in one year, not a time unit. The converter uses the exact SI speed of light and a Julian year of 365.25 days, then reports the same distance in kilometres, astronomical units, and parsecs. The travel-time output is a light-signal time in vacuum; it is not a spacecraft travel time or a promise that matter can travel at light speed.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Distance — ly; minimum 1.0E-6; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Distance | 4.2465 |
4.2465 light-years is about 4.019e16 m, 4.019e13 km, 268,600 AU, and 1.301 parsecs; a light signal takes 4.2465 Julian years.
Assumptions and limits
- The distance is a positive scalar number of light-years.
- One year for the definition is the Julian year of 365.25 days.
- Light travels in vacuum at the exact SI speed of 299,792,458 m/s.
- The parsec conversion uses 3.0856775814913673 × 10¹⁶ m per parsec.
- The travel-time interpretation is for a light signal in vacuum and ignores medium delay, gravitational effects, and cosmological distance definitions.
- No spacecraft propulsion, acceleration, relativity, redshift, or observation-date model is included.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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