an astrolabe
I think you're thinking of a compass.
The first compass was invented around 247 B.C. in China and by the eleventh century it was used for navigation. In medieval Europe around 1300 the dry compass was invented and was replaced by the liquid filled magnetic compass in the early twentieth century. A compass is a navigational instrument which is used for determining the direction related to the Earth's magnetic poles......by shaheer iqbal
Patricia Era Bath invented the tool used to fix cataracts. The tool is the Laserphaco Probe and it was patented in 1988.
The main difference of the Chinese compass with the existing compass today is that the former makes use of ferrites or magnetic oxides. These are natural minerals that attract iron and other metals. Large deposits of ferrites were discovered thousands of years ago in the district of Magnesia in Asia Minor. The second difference is that the Chinese compass is always pointing on the south while the invented compass points to the north. The third is that invented compass is basically used for navigational purposes whereas the Chinese compass is used as a navigational tool and also as a beautiful piece of home décor and for Feng Shui.
Patricia Bath
A navigational tool with a needle is a compass because it helps you to navigate which is cosidered as a tool. A compass has a needle inside to point which way is north. There is your answer :)
I don't know the answer so can you please help me. This is about The Rise of Islam.
A compass fits this definition.
a compas
is a tool used for finding the right direction! example compass rose!!
Francis Drake
That's the purpose of the sextant.
he usd a compass and an astrolabe.
I think you're thinking of a compass.
I think you're thinking of a compass.
It's not necessary at all. But the fact that it can be usedas a navigational tool makes it quite useful.
Wristwatches were developed by miniaturizing navigational chronometers.