Would like to start a discussion on one of the biggest blunders ever committed by our ancestors. Time keeping! Explain AM and PM to a five year old and you will understand why. You have a sundial in front of you. Now the best building for everyone in your medieval village to see the exact time would be the church. Mechanical movements now are good enough to keep time. So call the stone mason in to punch a hole through the steeple wall drag the sundial (freshly made hole where the dial use to be) with a pulley system up, mortar it in and push the bar through hook up the clock mechanism done. Everyone can now see what time it is. This is probably the way the 12 ended on top of all our clocks. Now what I am proposing is to place the " 6 on Top" instead of the twelve, turning time literally on its head. So now you have daylight and darkness in 12 hour chunks that don't cut the day or night in half using AM and PM. Try it out in real time. The app (6 on Top) is free for you to download. https://itunes.apple.com/us/app/6-0n-top/id431473891?mt=12 Warning: it takes a 24 hour period to digest the change. An open discussion would be awesome. I am the developer of the app.