You use a telescope to observe stars, and sometimes also use a star map.
A spectrometer is used to determine the composition of stars, and how fast they are going relative to Earth.
an instrument used by sailors to determine their location by observing the positions of stars
Astronomy, from the greek astra, meaning stars.
Terrestrial telescope
An astrolabe is an old instrument used to calculate the position of celestial bodies. Here are some sentences.I found an antique astrolabe in an old store.An astrolabe was used before the sextant was invented.Polish that astrolabe so it doesn't tarnish.
Telescopes are used for observing stars.
telescope
A instrument used for viewing and observing
A telescope is an instrument that is highly used.
Electron microscope.
telescopes
PERISCOPE
At the Age of Exploration they used telescope to observe stars.
An observatory is a location used for observing terrestrial and/or celestial events
A spectrometer is used to determine the composition of stars, and how fast they are going relative to Earth.
That is a telescope
Spectroscope