Astronomical unit to Second
Compare Astronomical unit and Second in the astronomy converter, including why these distance-and-time units need compatible families for a direct conversion.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Converter
Astronomy Converter
Convert astronomical length, mass, time, and distance units by compatible family.
Context values
Some unit families need one extra value for a physically accurate result.
Use the converter to see the formula.
Astronomical unit measures distance and Second measures time, so choose two units from the same family for a direct result.
Reserved above the conversion cards and below the converter.
Formula
Astronomical unit and Second measure different physical quantities (distance and time), so there is no single fixed multiplication factor between them.
The astronomy converter is dimension-aware: pick two distance units, or two time units, to get a direct, exact result.
Conversion table
Because astronomical unit (distance) and second (time) measure different physical quantities, there is no meaningful numeric conversion table between them.
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
What is astronomical unit?
An astronomical unit (AU) is the mean Earth-Sun distance, about 149.6 million kilometers.
What is second?
The second is the SI base unit of time.
Can I convert astronomical unit to second?
Not directly. Astronomical unit is a distance unit and Second is a time unit, and the astronomy converter keeps these families separate so results stay physically meaningful.
Why doesn't the converter give a result for this pair?
Converting between distance and time would require an extra physical assumption (such as a specific object's density, composition, or motion), which isn't a fixed constant the way distance-to-distance or time-to-time factors are.
What should I use astronomical unit for?
Use astronomical unit together with other distance units, such as the ones listed under related conversions below.
What should I use second for?
Use second together with other time units to get an exact, dimension-consistent result.
Reserved between the FAQ and the article so the page stays balanced.
About this conversion
This page compares astronomical unit (AU) and second (s) inside the astronomy converter.
An astronomical unit (AU) is the mean Earth-Sun distance, about 149.6 million kilometers.
The second is the SI base unit of time.
Astronomical unit measures distance while Second measures time. Because these are different physical dimensions, the astronomy converter does not produce a direct numeric result for this pair — the same way a length can't be converted to a mass without extra information.
Open the calculator above and pick two units from the same family (distance with distance, or time with time) for an instant, exact conversion.