# Gigasecond Calculate the moment when someone has lived for 10^9 seconds. A gigasecond is 10^9 (1,000,000,000) seconds. * * * * For installation and learning resources, refer to the [exercism Racket page](http://exercism.io/languages/racket). You can run the provided tests through DrRacket, or via the command line. To run the test through DrRacket, simply open the test file and click the 'Run' button in the upper right. To run the test from the command line, simply run the test from the exercise directory. For example, if the test suite is called `hello-world-test.rkt`, you can run the following command: ``` raco test hello-world-test.rkt ``` which will display the following: ``` raco test: (submod "hello-world-test.rkt" test) 2 success(es) 0 failure(s) 0 error(s) 2 test(s) run 0 2 tests passed ``` ## Source Chapter 9 in Chris Pine's online Learn to Program tutorial. [http://pine.fm/LearnToProgram/?Chapter=09](http://pine.fm/LearnToProgram/?Chapter=09) ## Submitting Incomplete Solutions It's possible to submit an incomplete solution so you can see how others have completed the exercise.