Animation
Speed
-
+
X rotation angle
Y rotation angle
Z rotation angle
Data output panel 2
Layers
Layer Manager

The basic design section of this work explained the static geometry from which the pyramid's architecture has been designed. Towards the end of that basic section it became apparent that the ellipses which form the basis of the geometry require rotating to solve some sections of the pyramid's architecture.

This intermediate design section continues by introducing a dynamic model of the Earth in which the Earth's cross section ellipse moves over time, as does the corresponding dynamic geometry.

### The user interface

The explanation of the intermediate design requires further display areas on the screen so that the dynamic geometry that is contained in this section can be controlled and displayed accurately.

### Animation control panel

The animation control panel is shown at the top of the screen, above the interactive drawing, and has four elements within it:

• Stop the system clock button
• Pause the clock button
• Start the clock button
• Animation speed control slider

These controls allow that clock to be stopped, started and have its speed adjusted.

### The data output panel

Below the interactive drawing, on the left side, are the angle output displays. These three images show

• X rotation angle - the axial tilt of the Earth. The image shows the Earth as viewed from the north of the pyramid along the X axis. The variations in the axial tilt over the short time spans used in the animations are too small to affect the displayed numerical value.
• Y rotation angle - the rotation of the Earth around the vertical axis of the pyramid. The image shows the Earth viewed from above the pyramid, which is above the north pole with no X axis rotation, and the Giza meridian is drawn onto the Earth and shown as the white line.
• Z rotation angle - remains set to zero for the whole of this section of work.

Start the clock and you will see an animation of the Earth rotating over time. This animation is a series of daily snapshots of the planet, being taken from the center of the Sun, and each animation frame is separated by a time interval equal to the rotation period of the Earth on its axis - a sidereal day .

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Last edited: 3rd July 2019
Last code/graphics edit: 29th March 2021