Skychart doesn't start in Fedora 17. The problem is related to lazarus that must be updated and properly patched to support glib2 >= 2.31 as from F17 and higher.
skychart-3.6-3.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/skychart-3.6-3.fc17
Package skychart-3.6-3.fc17: * should fix your issue, * was pushed to the Fedora 17 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing skychart-3.6-3.fc17' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-8448/skychart-3.6-3.fc17 then log in and leave karma (feedback).
skychart-3.6-3.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.