Sidereal Time Calculator
Calculate the local sidereal time (LST) and Greenwich sidereal time (GST) based on your local date, time, and longitude. Useful for astronomy and satellite tracking.
Published by:
isCalculator Editorial Team
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How to use this tool?
- 1 Enter the requested data in the fields above carefully.
- 2 Click the calculate button to process the information instantly.
- 3 Analyze the detailed result and the formula explanation presented below.
- 4 You can print, share, or even embed the calculator on your own site for free.
Unlike traditional platforms, our AI tools adapt to specific user needs. They include detailed explanations of the formulas used, ensuring transparency in results. Furthermore, our design is focused on user experience, eliminating distractions and focusing on what really matters: your data and conclusions.
Previous Results
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Frequently Asked Questions
Sidereal time is a timekeeping system based on Earth's rotation relative to distant stars. It is used in astronomy to locate celestial objects.
Greenwich Sidereal Time (GST) is the sidereal time at the Prime Meridian. Local Sidereal Time (LST) adjusts GST for your longitude, so it represents the sidereal time at your location.
Longitudes west of Greenwich are negative (e.g., New York is -74°), and east are positive. This ensures correct calculation of LST.
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