In science or geography classes, teachers often talk about the motion of the Earth and the Moon, but if the teacher just narrates boringly, the effect will not be good, in fact, you can simulate the above motion effect through PPT, so that students can have a visual understanding.
Quickly simulate the rotation of the earth
Since the globe that the teacher brings to the classroom is too small, it is estimated that not many students can see it clearly except the teacher. If you use PPT to simulate the rotation of the earth, you can project it on the big screen without the above-mentioned drawbacks. Let’s try to make an animation of the Earth’s rotation in PowerPoint.
First prepare a mask picture, which can be achieved in an image software such as Fireworks, click Fireworks “File → New” menu command, open the “New Document” dialog box, follow the prompts to create a size of 1080 × 610 pixels of transparent background canvas. Then click the menu “File → Import” command, will be added as a simulation of the Earth’s rotation of the PPT background image, and then click the left side of the “Bitmap” panel in the “Ellipse Selection Box “button, hold down the Shift key while drawing a circle in the center of the canvas, and then press the Ctrl + X shortcut key to delete the drawn circle, and finally save it as a PNG format picture to spare (Figure 1).
Tip: Although PowerPoint has the function of making masked pictures, but a tedious operation, the second to make a good masked picture can not be well integrated with the background image of the PPT, so in this case the author used Fireworks to make masked pictures first.
Now run PowerPoint (to 2016 version for example), create a PPT document named “globe.PPTX” and save it. Then in the “Insert” tab, click the “Picture” button, insert the PPT background image as a simulation of the rotation of the Earth, and then follow the same steps, insert a world map picture, copy and paste it, and put them together (Figure 2).
Finally, select both world maps and right-click on them, and select the “Combine → Combine” command to combine them into one. Note that it is not necessary to copy and “combine” two world maps with identical content into one, but after this process, the earth will rotate better.
Next, let’s add an animation effect. Select the world map picture, in the “Animation” tab, click “Add Animation → Other Action Paths → Left” command to add an animation effect for its movement to the left. Then double-click to open the “Left” dialog box and do the following (Figure 3).
In the “Timing” tab, set the “Start” parameter to “After the previous animation”. Set the “Period” and “Repeat” parameters to “Medium” and “Until next click” respectively.
Switch to the “Effect” tab and set the “Smooth Start”, “Smooth End” and “Bounce End” parameters to “0”. parameters set to “0” seconds and click the “OK” button can be.
Finally add a mask picture, switch to the “Insert” tab, click the “Insert” button, the previous edited mask picture added and arranged (Figure 4), and then press the F5 shortcut key can be previewed to simulate the effect of the rotation of the Earth.
The Earth and the Moon move together
We all know that the Earth and the Moon not only rotate by themselves, but also the Moon revolves around the Earth and the Earth revolves around the Sun at the same time. This complex motion relationship can also be shown by using PPT animation.
PPTX” PPT document, insert a bright black background image as the universe. Then add the sun, earth and moon pictures you prepared in advance and arrange them (Figure 5).
Select the Earth picture, while clicking the “Add Animation → Other Action Paths → Circle Expansion” command to add a “Circle Expansion” animation effect, and then adjust the size and location of its trajectory, so that the sun is exactly where the trajectory of the circle Center (Figure 6). And then select the Earth picture, click the “Add Animation → Tour Spiral” command, to add a tour spiral animation effects.
Double click on the right side of the “Animation Pane” with the “Circle Extension” animation-related options (the first one on the top), open the “Timing” tab (Figure 7), set the “Start” parameter to “After Previous Animation”, the “Period” parameter to “30 seconds”, and the “Repeat” parameter to “Until End of Slide”.
Double click the right animation pane with the “Gyroscope” related options, open the “Timing” tab (Figure 8), set the “Start” parameter to “Simultaneous with previous animation”, the “Period” parameter to “Fast”, and the “Repeat” parameter to “Until end of slide”.
After completing the above animation parameters, then follow the previous procedure, select the moon shown in Figure 6, add “circle expansion” and “spiral” animation effects for it, and set the same animation parameters for these two animation effects as for the earth. The animation parameters for these two effects are the same as those for the Earth.
Tip: For the “circle extension” animation effect, the motion track of the Earth and the motion track of the Moon are the same circle (you can adjust the position and size of their circular motion tracks to make them overlap). In addition, select the moon’s “circle extension” animation and rotate it so that the starting point of the moon’s motion avoids coinciding with the earth (the small triangle on the circle track), so that the moon can rotate around the earth at the same time.
After the above steps, press the F5 shortcut key and you will see the Earth rotating around the Sun while rotating on its own (Figure 9). At the same time, the Moon will also revolve around the Earth while rotating.