What is a second (sidereal)?

A second (sidereal) is a unit of time defined as 1/86,400 of a sidereal day, tracking Earth's rotation relative to fixed stars rather than the Sun.

Why convert second (sidereal) to second [s]?

Converting to the standard SI second [s] allows sidereal time to be synchronized with civil, scientific, and engineering time systems based on atomic standards.

Where is second (sidereal) commonly used?

Second (sidereal) is mainly used in astronomy, astrometry, telescope tracking, and space flight attitude calculations.

Convert from Second (Sidereal) to Second [s] - Online Time Unit Converter

Easily convert time values from second (sidereal), a unit used in astronomy, to the standard SI second [s] used worldwide for civil, scientific, and engineering timing.

Second (sidereal)

Second [s]

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Second (sidereal) to Second [s] Conversion Table

Second (sidereal)	Second [s]

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 Second [s] Conversion Table
Second (sidereal)	Second [s]

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What Is This Tool?

This converter transforms time measurements from second (sidereal), a unit based on Earth's rotation relative to distant stars, into the international standard second [s], used extensively in everyday and scientific timekeeping.

How to Use This Tool?

Enter the time value in seconds (sidereal) that you wish to convert
Select 'second (sidereal)' as the input unit and 'second [s]' as the output unit
Click the convert button to get the equivalent time in SI seconds
Use the result for astronomical calculations or standard time measurements

Key Features

Converts sidereal seconds to SI seconds with a precise conversion rate
Supports applications in astronomy, astrometry, and telescope tracking
Browser-based tool requiring no installation
User-friendly interface for quick and accurate conversions

Examples

10 seconds (sidereal) converts to approximately 9.972695602 second [s]
100 seconds (sidereal) converts to approximately 99.72695602 second [s]

Common Use Cases

Calculating sidereal time for astronomical coordinate conversions and star catalogs
Setting telescope tracking rates for following stars via sidereal tracking
Computing Earth's rotation angle and timing in astrometry and space-flight attitude calculations
Synchronizing sidereal time measurements with standard atomic time used in science and engineering

Tips & Best Practices

Account for minor variations in Earth's rotation when using converted times in high-precision applications
Use this conversion to align sidereal timing systems with international time standards
Validate telescope and tracking system settings by converting sidereal time to standard SI seconds
Recognize that sidereal seconds and SI seconds differ slightly and treat this difference carefully

Limitations

Conversion assumes stable Earth rotation characteristics, which may vary slightly
Minor fluctuations such as leap seconds affect real-world timing accuracy
Sidereal seconds and SI seconds are not identical; high-precision contexts require explicit conversion consideration

Frequently Asked Questions

What is a second (sidereal)?: A second (sidereal) is a unit of time defined as 1/86,400 of a sidereal day, tracking Earth's rotation relative to fixed stars rather than the Sun.
Why convert second (sidereal) to second [s]?: Converting to the standard SI second [s] allows sidereal time to be synchronized with civil, scientific, and engineering time systems based on atomic standards.
Where is second (sidereal) commonly used?: Second (sidereal) is mainly used in astronomy, astrometry, telescope tracking, and space flight attitude calculations.

Key Terminology

Second (sidereal): A time unit based on Earth's rotation relative to fixed stars, defined as 1/86,400 of a sidereal day.
Second [s]: The international base unit of time defined by cesium-133 atom radiation periods, used universally in science and engineering.
Sidereal Day: The period it takes for Earth to complete one rotation relative to distant celestial objects.

Quick Knowledge Check

What does the second (sidereal) measure?

One solar day divided into seconds

Earth's rotation relative to fixed stars

The duration of a cesium atom transition

What is the standard unit second [s] based on?

The interval of Earth's rotation

The cesium-133 atom radiation periods

A fixed number of milliseconds

Why is conversion important between second (sidereal) and second [s]?

To calculate local time zones

To correlate sidereal and atomic time for precision

To measure durations of chemical reactions

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