The best way to observe the sun is by projecting the image.

1. Use two pieces of cardboard. (such as flaps from a box)
2. Make a small pinhole in the centre of one piece.
3. Take both pieces in your hand.
4. Stand with your back to the sun.
5. Hold the piece with the pinhole, then place the other piece (the screen) behind it.
6. The sunlight will pass through the pinhole and form an image on the screen.
7. Adjust the distance between the two pieces to change the size of the image.

A solar eclipse is when the moon passes between the Earth and the sun. The moon's shadow falls on the Earth's surface and blocks out the sun's light as we see it from the Earth.

The moon crosses the Earth's orbital plane only twice a year because the moon ...