What is a second (sidereal)?

A second (sidereal) represents 1/86,400 of a sidereal day, reflecting Earth's rotation relative to distant stars rather than the Sun.

Why convert second (sidereal) to milliseconds?

Converting to milliseconds allows for more precise measurements needed in astronomy, instrumentation, and electronic timing systems.

Is 1 second (sidereal) exactly equal to 1 standard second?

No, a sidereal second is approximately 0.9972695663 of an international (SI) second, slightly shorter due to Earth's rotation relative to stars.

How to Convert from Second (sidereal) to Millisecond [ms]?

Learn how to convert time from second (sidereal) to millisecond [ms] using the accurate conversion rate, useful for astronomy and high-resolution time measurements.

Second (sidereal)

Millisecond [ms]

Please check your input. It must be a valid numeric value.

Second (sidereal) to Millisecond [ms] Conversion Table

Second (sidereal)	Millisecond [ms]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Second (sidereal) to Millisecond [ms] Conversion Table
Second (sidereal)	Millisecond [ms]

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What Is This Tool?

This tool converts time values from second (sidereal), a unit based on Earth's rotation relative to stars, into milliseconds, suitable for precise timing and scientific applications.

How to Use This Tool?

Enter the time value in seconds (sidereal) you wish to convert
Select 'second (sidereal)' as the input unit and 'millisecond [ms]' as the output unit
Click the convert button to get the equivalent milliseconds value

Key Features

Converts sidereal seconds to milliseconds using an exact conversion rate
Useful for astronomy, telescope calibration, and astrophysics calculations
Browser-based and easy to use with clear input and output fields

Examples

2 seconds (sidereal) equals approximately 1994.5391203704 milliseconds
0.5 seconds (sidereal) equals approximately 498.6347800926 milliseconds

Common Use Cases

Calculating sidereal time for astronomical coordinate conversion and star cataloging
Adjusting telescope tracking rates to follow celestial objects
Measuring and expressing small time intervals in scientific instrumentation and experiments

Tips & Best Practices

Double-check the unit selection before converting to ensure accuracy
Use this conversion for applications requiring high temporal resolution linked to sidereal timing
Be aware of rounding effects when working at extremely high precision

Limitations

Sidereal seconds are slightly shorter than standard SI seconds, which can affect direct comparisons
Rounding when converting to milliseconds can limit precision for some scientific uses
Assumes a constant sidereal day length despite Earth's rotational variations

Frequently Asked Questions

What is a second (sidereal)?: A second (sidereal) represents 1/86,400 of a sidereal day, reflecting Earth's rotation relative to distant stars rather than the Sun.
Why convert second (sidereal) to milliseconds?: Converting to milliseconds allows for more precise measurements needed in astronomy, instrumentation, and electronic timing systems.
Is 1 second (sidereal) exactly equal to 1 standard second?: No, a sidereal second is approximately 0.9972695663 of an international (SI) second, slightly shorter due to Earth's rotation relative to stars.

Key Terminology

Second (sidereal): A time unit based on Earth's rotation relative to fixed stars, equal to 1/86,400 of a sidereal day.
Millisecond [ms]: An SI-derived time unit equal to one thousandth of a second (10⁻³ s), used for measuring brief durations.
Sidereal Day: The period of Earth's rotation measured relative to fixed stars, shorter than the solar day.

Quick Knowledge Check

What does a second (sidereal) measure?

Time based on the Sun's position

Time based on Earth's rotation relative to distant stars

Time based on the lunar cycle

How many milliseconds equal 1 second (sidereal)?

1000 ms

997.2695601852 ms

86400 ms

Which use case pertains to converting from second (sidereal) to milliseconds?

Measuring latencies in computer networks

Setting telescope tracking rates in astronomy

Checking daily weather forecasts

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