As discussed in a number of sources, a leap second is being added on June 30. Here's how to prepare your copy of GMAT:


  1. Review the GMAT User Guide.

  2. Download the updated US Naval Observatory leap second file:

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

  4. Download the updated NAIF leap second file:


  5. Place this file in your GMAT data folder:

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

    LSK_FILE               = TIME_PATH/naif0011.tls
  7. Restart GMAT.


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


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