Spaceship parts cannot be built prior to 1 AD

Hello Everyone! This is just a quick message to those who don't know. After not playing for close to a decade I finally dusted off the old game and got it to work in Windows 10. I noticed after building the Apollo Program that I couldn't start building any of the parts. Several google searches later I came up with the answer. I thought I would share in hopes of saving someone else the trouble. Even after all these years it's still a fantastic game and I wouldn't have gotten it to work on my computer without all the help from this site. Thank you! I hope this little nugget helps someone down the road. Go Sioux!

This is a known behaviour, 1 AD is the earliest moment you can build spaceship parts. So the ultimate challenge (or one of th ultimate challenges) is to build and launch (via zoom-to-home) you spaceship in 1 AD, which is doable (but still requires good gameplay) on chieftain and on large maps on warlord and prince level and excellent gameplay and circumstances on levels above.