On May 20/21 (depending on where you are), the Moon will pass between the Earth and the Sun, causing a Solar Eclipse. As the Moon is at one of the points in its orbit when its farthest from the Earth, from certain locations on Earth, the eclipse will be “annular”, which means the Moon will almost totally block out the Sun: but not quite – there will be a bright ring of sunlight around the Moon. From other locations, the Moon will appear to cover part of the Sun’s disk (a partial Solar Eclipse). This is a relatively rare event, and well worth observing!
The best places to view the Eclipse on the Chinese / Taiwan coast, and west coast of the US. The east coast of the US will not be able to see the Eclipse, as the Sun will set before it occurs. Here is a map of the best US locations:
NASA / JPL, Jane Houston Jones
Please do NOT stare directly at the Sun, or you will damage your eyes! Use specially designed solar filters to look at the Sun, or look at a projected image. The simplest way to observe the Moon covering the Sun is to simply look at the light cast through a pin-hole in a piece of paper. There will be plenty of media cover and streaming web sites if you can’t see the Sun or the annular effect yourself.
For more information, here are some links: