The GPS (global positioning system) satellite is far more accurate and easy to use. As to which is more important, that is a tough question, and depends upon your circumstances.
http://en.wikipedia.org/wiki/Sextant
you can find sextant on history.com
you use a sextant to navigate.
The least count of a sextant is the smallest angle that can be measured with the instrument. It is typically determined by the design of the sextant and the precision of its scales. The least count is important for accurately measuring angles in celestial navigation and other applications where precise angular measurements are required.
The sextant was developed in the 18th century, building on earlier navigational instruments. While no single person is credited with its invention, important contributions were made by John Hadley and Thomas Godfrey, who independently created the reflecting octant in the 1730s, which laid the groundwork for the sextant. The sextant itself was later refined and became a crucial tool for navigation at sea.
It's important that more than one Landsat satellite because one satellite can orbit the whole earth so if more come than it will take 18 days to scan the earth
you draw a sextant by looking at googler in the images.
It's important that more than one Landsat satellite because one satellite can orbit the whole earth so if more come than it will take 18 days to scan the earth
the sextant helped me navagate my way to alaska
the moon
The satellite is important to science because that's how we are able to tell the weather days ahead before it comes.
how many years that the sextant become a symbol of navigation
It's important that more than one Landsat satellite because one satellite can orbit the whole earth so if more come than it will take 18 days to scan the earth