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    Local Time to Sidereal Time Converter  
     
    longitude local time (hrs) local time (min) year month day Diff UT-local time (hrs) GMST  
     
           
    Universal Time (UT) Julian Date Greenwich Sidereal Time  
     
    The green values are adjustable values. Enter the date and local time information, as well as the longitude west of Greenwich. Also input the hour difference between universal time zone and the local time zone. Then click on the update button. This will calculate the Greenwich sidereal time shown on the right.