They were used for both terrestrial applications and astronomy.

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The first known practical telescopes were refracting telescopes
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The first known practical telescopes were refracting telescopes invented in the Netherlands at the beginning of the 17th century, by using glass lenses.
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They were used for both terrestrial applications and astronomy.
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https://en.wikipedia.org/wiki/Telescope
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A telescope is an optical instrument using lenses, curved mirrors [DISPUTED], or a combination of both to observe distant objects ...
The word telescope now refers to a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors.
The first known practical telescopes were refracting telescopes invented in the Netherlands at the beginning of the 17th century, by using glass lenses.
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