All you need to do is follow the Twitter account @twisst
It will sent you personalized alerts as tweet to you based on your location specified in your Twitter profile either as text or as coordinates.
This online Service is built by Dutch science reporter Govert Schilling and journalist Jaap Meijers.
How Twisst works?
1. Twisst collects location details of Twitter users following @twisst.
2.It uses Google Map and Yahoo to get geographic coordinates for the location of Twitter users..
3.Twisst uses www.heavens-above.com to see when ISS will fly over at those coordinates.
4.geographic database Geonames will be referred to get the local time of Twitter followers.
5.So, every time the International Space Station is coming, Twisst will send alert to Twitter followers in their local time.
The International Space Station serves primarily as a research laboratory .
As of Today, ISS is the largest artificial satellite in Earth orbit.
This project was jointly done by many organizations including NASA (USA), RKA (Russia), JAXA(Japan).
The space station can be seen from Earth with the naked eye.
You can see the recent scenes from ISS here.