We stand on a globe which is rotating around its own axis and which is orbiting the sun (that's common sense - but there are some people who are not sure about it). Because the earth is that huge in relation to our bodies and most of our direct environment - desks, trees, houses, mountains, rivers, etc. - which takes the same movement as us we we hardly realize the rotation.

Yes, we can figure out the rotation by numbers: The earth has a diameter of some 12 700 km/7 900 mi; one 360° rotation takes 23 h 56 min 04 sec; it takes a year for one orbit around the sun; at the equator the rotation speed is supersonic and at the pole it is zero. But this numbers will not really give us the sense.

Let's take a telescope, fix it to the ground and look through it straight to the sky. The Saturn stays almost still in space within this short period of time - just the telescope moves by the rotation of the earth. What we can see is this:



You need to have a telescope to be able to realize the movement.


Another possibility to pull the rug from under your feet is by watching moving shadows caused by moving light sources. To be more precise: watching moving shadows caused by a moving stick illuminated by a fixed light source, the sun. The stick is fixed to the ground and therefore the earth, which is rotating. We can observe something like this:

And this is what we want: To give you an live imagination of sundials around the world - each of them displays 12:00 L.A.T. actually while you watch the camera's view. After a few minutes automatically you are switched to the next-west-sundial. At the full power of this project you can watch sundials 24 h per day / 7 days a week each showing high noon at their respective place.

As the earth is rotating we can see the virtual movement of the sun across the sky. For visualizing this movement we put up this project Earth L.A.T. 12:00:

The local apparent time (L.A.T.) 12:00 is defined as the time the sun is appearing at the local south meridian – the sun is located exactly south and at its highest daily elevation. Sundials show L.A.T. by the moving shadow.

We will produce a 24/7 live video stream of shadows crossing the 12:00 line at this site. Every fewl minutes the next sundial will enter the live stream – so one can follow L.A.T. 12:00 the earth round and really sense the moving globe.

Therefore we are on to collect as many webcams as possible delivering live images of sundials. The different live images are switched online on local apparent time 12:00 consecutive and while there is no cloud hiding the sun. This procedure will work automatically.

With regard to the project: There is still a lot to be done!

But: We already have one partner sundial: KEPLERUHR - as far as they implement a livestream you can watch its livestream at this site.

© Kurt Niel

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