Direct conversion
Convert sidereal day [sidereal day] to second [s] instantly with formula, examples, chart, and FAQs.
1 sidereal day [sidereal day] = 86164.0905 second [s]
1 sidereal day [sidereal day] = 86164.0905 second [s]
Example: 1 sidereal day [sidereal day] equals 86164.0905 second [s].
Time conversions use second as the reference unit. Calendar-style values such as average month and average Gregorian year are approximate by definition.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-08-14.
The sidereal day (sidereal day) is a time unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse sidereal day when comparing time values, checking specifications, converting between systems, or preparing quick estimates.
The second is the SI base unit of time.
HistoryThe second moved from astronomical definitions to an atomic definition for high precision.
Current useSeconds are used in science, sports timing, computing, navigation, media, and everyday clocks.
| sidereal day [sidereal day] | second [s] |
|---|---|
| 1 | 86164.0905 |
| 2 | 172328.181 |
| 5 | 430820.4525 |
| 10 | 861640.905 |
| 20 | 1723281.81 |
| 25 | 2154102.2625 |
| 50 | 4308204.525 |
| 100 | 8616409.05 |
| 1000 | 86164090.5 |
Use this formula: 1 sidereal day [sidereal day] = 86164.0905 second [s] Enter your value in the calculator and the result updates instantly.
1 sidereal day [sidereal day] equals 86164.0905 second [s].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.