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1. Review the GMAT User Guide on the subject.
   
   
2. Download the updated US Naval Observatory leap second file:
   tai-utc.dat 
   
   

3. Overwrite GMAT's old file with this new copy:

   Code Block
   <GMAT>\data\time\tai-utc.dat

4. Download the updated NAIF leap second file:
naif0011.tls 

    

5. Place this file in your GMAT data folder:

   Code Block
   <GMAT>\data\time\naif0011.tls

6. Modify your GMAT startup file (<GMAT>\bin\gmat_startup_file.txt) to point to the new NAIF file:
   

   Code Block
   LSK_FILE = TIME_PATH/naif0011.tls

7. Restart GMAT.

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That's it! If you have any issues, post to try any of our help resources:

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