This is an application which find the Quasi-Zenith Satellite "Michibiki".
"Michibiki" is going the earth around with the cycle of 23 hours and 56 minutes.
However, it is over Japan among one day only for about 8 hours.
You can not know when it is over Japan, since it shifts every 4 minutes every day.
Please use, when you happen to think where is "Michibiki" now.
It predicts by calculation from the orbital element by CelesTrak.
If you have Nexus7 (2012 model), you can find the actual position of "Michibiki".
Please look at the following for details (Japanese)