# Experiment with multiple instrument places all over the earth

## Main Question or Discussion Point

I want to design an experiment with multiple instruments places all over the earth in such a way that at any time, at least one of the instruments can observe the sun. What is the maximum separation of instruments permitted?

## Answers and Replies

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Step one in solving a homework problem (same goes for the other threads you just started) is to draw a picture

Step one in solving a homework problem (same goes for the other threads you just started) is to draw a picture
please give some ideas about tem sir. I am just a class 9th student :)

russ_watters
Mentor
Ideas about what? He said draw a picture! A picture of the Earth starts with a circle...

Ideas about what? He said draw a picture! A picture of the Earth starts with a circle...
Ok! the sun will be visible from one hemispher for sure, am i right. So I think it should be 1/2 the circumference of earth.

Why the frown and uncertainty?

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