Windows · Free download · Astronomy
Sidereal Clockv1.0
lets you keep track of the celestial time.
- Operating system
- Windows 95/98/Me/NT/2000/Windows 10/11
- File size
- 1 MB
- License
- Freeware
- Last updated
- Mar 12, 2026
381 downloads·1202 page views
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Overview
What is Sidereal Clock?
lets you keep track of the celestial time.
In depth
A closer look at Sidereal Clock
The Sidereal Clock calculates the local mean sidereal time (LMST) based upon the computer's local clock, your time zone, and your west longitude.
Astronomy buffs use this type of clock which is based upon "star time". If you used your normal clock and timed when a distant star passed due south of you each night, you would find that each night it passed about four minutes earlier. Thus, we swing into position to see a given point in the sky a little earlier every night.
Celestial objects are located on the sky by a coordinate system which includes a celestial longitude (right ascension) and latitude (declination). The right ascension of a celestial object is the same as the local mean sidereal time that the object passes an imaginary line drawn from the celestial pole to due south (180 degrees azimuth). Thus, if you know the local mean sidereal time (LMST) you also know what objects are in meridian transit at your location.
Verdict
Should you download Sidereal Clock?
Sidereal Clock runs on Windows 95/98/Me/NT/2000/Windows 10/11 and is available under the Freeware license — the installer is 1 MB. We’ve catalogued it under Astronomy.
Verified clean. Every Sidereal Clock build on SoftLookup is scanned for viruses, spyware, adware, trojans and backdoors. We re-test on every update.
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At a glance
Sidereal Clock specifications
- Category
- Astronomy
- Publisher
- Radio-Sky Publishing
- Last updated
- Mar 12, 2026
- License
- Freeware
- Operating system
- Windows 95/98/Me/NT/2000/Windows 10/11
- File size
- 1 MB
- Price
- Free
- Page views
- 1202
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