The size of a telescope depends on many factors, but mainly, on its size. For example, a telescope with a diameter (of the main lens or mirror) of 100 mm will cost much less than one with a diameter of 500 mm.
A Galilean Telescope is also an Astronomical Telescope so it is just a subset of Astronomical Telescopes.
He didn't he improved the existing telescope and turned it to astronomical use around 1609
An astronomical telescope is one that is used in astronomy - i.e., to watch stars, planets, comets, etc.
Cassegrain
The cost of space travel is still astronomical. A telescope is used for astronomical sightings.
Galileo was the first person to use a telescope for astronomical research.
What were the 3 primary scientific targets photographed by the astronomical telescope "Stratoscope II"? *
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Copernicus did not use a telescope in his astronomical work.
The first person to use a telescope for astronomical observation was Galileo Galilei in the early 17th century. He made groundbreaking discoveries, such as the moons of Jupiter and the phases of Venus, using his telescope.
galilieo galilei
An astrograph is a telescope designed and used for astronomical photography.