This is a good reminder about aerospace in the '80's. Now think about the 1960's when I estimate 90% of the calculations for the Apollo moon project were done

This is a good reminder about aerospace in the '80's. Now think about the 1960's when I estimate 90% of the calculations for the Apollo moon project were done on slide rules. NASA did have the best computers available and used them to the max but that tied them up so much they were only used for those things where it was thought you just had to have a computer for. And this was by design a highly computerized spacecraft itself like nothing ever before. The better your slide rule skills, the better your computer abilities may be once you get a hold of a computer. That's what computers were made for, to augment a well established inuitive manual calculation capability of accomplishing all kinds of very advanced engineering.