Frequently Asked Questions...
How does a marine chronometer determine longitude?
I get that's it's accurate with seconds and stuff, but how does it determine the longitude of where a ship/boat is at? I just find it all really confusing and I can't get my head round it 
If someone could explain it briefly without using too many technical terms (I'm only 13) that would be great.
Thanks!
Answer:
It does not depend on the speed of the ship, actually, because the chronometer is still useful even when the ship is not moving.
Someone on the ship makes an observation of the position of the Sun, say at noon. Because Earth rotates, points on the surface at different longitudes will face the Sun at different times of the day. The chronometer is set to show the time in a standard location (such as Greenwich), and to keep time very accurately and precisely. When the ship is away from Greenwich, then when it is noon with respect to the ship, it is not noon at Greenwich. The amount of difference of time, as shown by the chronometer, translates into how far around the Earth the ship is.
Suppose that the ship observes noon when the chronometer shows 3 pm. Then the Earth has rotated 3/24 = 1/8 of the way eastward since it was noon at Greenwich. The circumference of Earth is computed according to the latitude (which is easy to determine with an instrument such as a sextant). 1/8 of the circumference of the circle at that latitude is then the distance west of Greenwich.
If the chronometer shows some time in the morning when it is noon at the ship, then the ship is some distance east of Greenwich; the longitude is computed in the same way as before.
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