GMAT News

Blog post edited by Joel Parker

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:
   [tai-utc.dat](ftp://maia.usno.navy.mil/ser7/tai-utc.dat) 

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

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

4. Download the updated NAIF leap second file:**[naif0011.tls](http://naif.jpl.nasa.gov/pub/naif/generic_kernels/lsk/naif0011.tls)**

5. Place this file in your GMAT data folder:

   <GMAT>\data\time\naif0011.tls
   

6. Modify your GMAT startup file (_<GMAT>_``\bin\gmat_startup_file.txt) to 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:

• GMAT User Guide
• User Forums
• [gmat-users](https://lists.sourceforge.net/lists/listinfo/gmat-users) mailing list

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