Date and Time
Local Date:
UTC offset (mins):
UTC:
LST:
GST:
Your Longitude:
in degrees, +ve for East of Greenwich, -ve for West
The local date and UTC shown above have been obtained from your device.

The Local Siderial Time (LST) is the Right Ascension (RA) coordinate value
that lies on your meridian for your local date and time. Your longitude must
be entered accurately (in degrees) for the LST to be correct.

GST is Greenwich Siderial Time which is the LST value for Greenwich, England which is zero degrees longitude.


Date and Time from timeanddate.com
If your system clock is incorrect the LST and GST calculated above will also be incorrect, to verify that your system clock is correct the time and date shown above is from timeanddate.com and should be the same as the UTC shown at the top from your system.









© Keith Ehren 2025.