Earth Centered Universe is now a free planetarium program for Windows. ECU was created by David J. Lane.  Maintenance of the software has now been taken over by Doug George.  To commemorate Dave's lifelong contributions to astronomy education and outreach, the software is now freely downloadable.   If you like ECU, please consider making a donation to StarFinder - The David Lane Astronomy Outreach Program. Diffraction Limited is pleased to host distribution of Earth Centered Universe. [