Why everyone doesn't see solar eclipse when it occurs?
You have to be in the moon's darkest shadow (umbra). This place is small, so other areas around the world won't see it.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Why everyone doesn't see solar eclipse when it occurs?
### Input: 
### Response: You have to be in the moon's darkest shadow (umbra). This place is small, so other areas around the world won't see it.