Just finished watching a documentary series called Gods In The Sky:
This is a terrific series from England explaining how Astronomy as we know it emerged out of myths and legends. It starts with the builders of the megalithic sites and covers Egypt, Greece, Rome, China, Islam, on up through today.
Some of the ancient myths are naturally based around sexual reproduction. So if you're showing it to kids you may have some questions to answer.
Its presented by Professor Allan Chapman, Oxford Historian, Christian and member of the Royal Astronomical Society.
This is also a good documentary for the religious, about the fact that Christianity and science (via astronomy) are NOT mutually exclusive.
Look for entertaining cameos by Sir Patrick Moore and others.
http://www.channel4.com/history/microsi ... ds_in_sky/