Sidereal Year to Millisecond Converter
Convert sidereal years to milliseconds with our free online time converter.
Quick Answer
1 Sidereal Year = 31558149504 milliseconds
Formula: Sidereal Year × conversion factor = Millisecond
Use the calculator below for instant, accurate conversions.
Our Accuracy Guarantee
All conversion formulas on UnitsConverter.io have been verified against NIST (National Institute of Standards and Technology) guidelines and international SI standards. Our calculations are accurate to 10 decimal places for standard conversions and use arbitrary precision arithmetic for astronomical units.
Sidereal Year to Millisecond Calculator
How to Use the Sidereal Year to Millisecond Calculator:
- Enter the value you want to convert in the 'From' field (Sidereal Year).
- The converted value in Millisecond will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Time category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Sidereal Year to Millisecond: Step-by-Step Guide
Converting Sidereal Year to Millisecond involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Sidereal Year = 3.1558e+10 millisecondsExample Calculation:
Convert 60 sidereal years: 60 × 3.1558e+10 = 1.8935e+12 milliseconds
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
Need to convert to other time units?
View all Time conversions →What is a Sidereal Year and a Millisecond?
A sidereal year is the time it takes for the Earth to complete one full orbit around the Sun relative to the distant, fixed stars. It represents the true orbital period of the Earth. Its duration is approximately 365.256363 mean solar days (or 365 days, 6 hours, 9 minutes, 9.76 seconds).
A millisecond is a unit of time equal to one-thousandth (1/1,000) of a second.
Note: The Sidereal Year is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Millisecond belongs to the imperial/US customary system.
History of the Sidereal Year and Millisecond
The concept of the sidereal year emerged from ancient astronomers observing the Sun's apparent path against the background constellations (the ecliptic). They noticed that the Sun returned to the same position relative to specific stars after a consistent period. This stellar-based measurement was distinct from the tropical year (based on the seasons or equinoxes), which was more relevant for agriculture and calendars. Accurately determining the sidereal year was crucial for understanding the Earth's true orbital motion and for long-term astronomical predictions.
The millisecond is derived from the SI base unit, the second, using the metric prefix 'milli-', indicating a factor of 10⁻³. Its common usage grew with the need for finer time measurements in science and technology, particularly in fields like computing and electronics.
Common Uses and Applications: sidereal years vs milliseconds
Explore the typical applications for both Sidereal Year (imperial/US) and Millisecond (imperial/US) to understand their common contexts.
Common Uses for sidereal years
The sidereal year is primarily used in:
- Astronomy & Astrophysics: For calculations involving the long-term orbital mechanics of the Earth and other celestial bodies within the solar system. It's fundamental for understanding the actual time it takes for planets to orbit the Sun.
- Celestial Mechanics: Used in models predicting the positions of stars and planets over extended periods.
- Defining Orbital Periods: Serves as the standard measure for the orbital period of Earth and is used comparatively for other planets.
It is generally not used for civil calendars, which are based on the tropical year to keep alignment with the seasons.
When to Use milliseconds
- Computing: Measuring network latency (ping times), hard drive seek times, human reaction times in psychological tests, frame duration in video (e.g., 60 fps is ~16.7 ms per frame).
- Audio: Measuring delays and processing times in audio signals.
- Sports: Timing in races where differences are extremely small (e.g., swimming, track and field).
- Science: Measuring short-duration events, such as the firing of a neuron or rapid chemical processes.
- User Interface: Often used as a target for response times in interactive systems (e.g., aiming for under 100 ms for a feeling of instant response).
Additional Unit Information
About Sidereal Year (sidereal year)
How long is a sidereal year in days?
A sidereal year is approximately 365.256363 mean solar days, which translates to about 365 days, 6 hours, 9 minutes, and 9.76 seconds.
What is the difference between a sidereal year and a tropical year?
A sidereal year measures the Earth's orbit relative to distant stars (one complete 360° revolution). A tropical year measures the time between successive vernal equinoxes (the start of spring in the Northern Hemisphere). Due to the precession of the equinoxes (a slow wobble in Earth's axis), the tropical year is slightly shorter (about 20 minutes) than the sidereal year (approx. 365.24219 days).
Why do calendars use the tropical year instead of the sidereal year?
Civil calendars, like the Gregorian calendar, are designed to keep the seasons occurring at roughly the same time each year. Since seasons are determined by the Earth's tilt and its position relative to the Sun (marked by equinoxes and solstices), the tropical year is the relevant measure for aligning the calendar with seasonal changes. Using the sidereal year would cause the seasons to gradually drift through the calendar months over centuries.
About Millisecond (ms)
How many milliseconds are in one second?
There are 1,000 milliseconds in a second.
How many milliseconds are in one minute?
There are 60,000 milliseconds in a minute (1000 ms/s * 60 s/min).
Is a millisecond a long time for a computer?
In computing terms, a millisecond can be quite long. Processors perform millions of operations in a millisecond. Network latency is often measured in tens or hundreds of milliseconds.
Conversion Table: Sidereal Year to Millisecond
| Sidereal Year (sidereal year) | Millisecond (ms) |
|---|---|
| 0.5 | 15,779,074,752 |
| 1 | 31,558,149,504 |
| 1.5 | 47,337,224,256 |
| 2 | 63,116,299,008 |
| 5 | 157,790,747,520 |
| 10 | 315,581,495,040 |
| 25 | 788,953,737,600 |
| 50 | 1,577,907,475,200 |
| 100 | 3,155,814,950,400 |
| 250 | 7,889,537,376,000 |
| 500 | 15,779,074,752,000 |
| 1,000 | 31,558,149,504,000 |
People Also Ask
How do I convert Sidereal Year to Millisecond?
To convert Sidereal Year to Millisecond, enter the value in Sidereal Year in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our time converter page to convert between other units in this category.
Learn more →What is the conversion factor from Sidereal Year to Millisecond?
The conversion factor depends on the specific relationship between Sidereal Year and Millisecond. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.
Can I convert Millisecond back to Sidereal Year?
Yes! You can easily convert Millisecond back to Sidereal Year by using the swap button (⇌) in the calculator above, or by visiting our Millisecond to Sidereal Year converter page. You can also explore other time conversions on our category page.
Learn more →What are common uses for Sidereal Year and Millisecond?
Sidereal Year and Millisecond are both standard units used in time measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our time converter for more conversion options.
For more time conversion questions, visit our FAQ page or explore our conversion guides.
Helpful Conversion Guides
Learn more about unit conversion with our comprehensive guides:
All Time Conversions
Other Time Units and Conversions
Explore other time units and their conversion options:
- Second (s) • Sidereal Year to Second
- Minute (min) • Sidereal Year to Minute
- Hour (h) • Sidereal Year to Hour
- Day (d) • Sidereal Year to Day
- Week (wk) • Sidereal Year to Week
- Month (mo) • Sidereal Year to Month
- Year (yr) • Sidereal Year to Year
- Microsecond (μs) • Sidereal Year to Microsecond
- Nanosecond (ns) • Sidereal Year to Nanosecond
- Decade (dec) • Sidereal Year to Decade
Verified Against Authority Standards
All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.
National Institute of Standards and Technology — Official time standards and definitions
Bureau International des Poids et Mesures — Definition of the SI base unit for time
Last verified: December 3, 2025