the 17th century
it back to the time of newton about 400 years back, newton first invented reflecting telescopes!
The non-optical telescope, primarily radio telescopes, were invented in the 1930s. One of the first and most notable radio telescopes was built by Karl Guthe Jansky in 1931.
1931
The telescope was invented in 1608 by Hans Lippershey.
Hans lippershey by:bryce
yes how were they to study the stars
The telescopes used by Leeuwenhoek, Huygens, and Galileo were refractors. Newton fashioned the first reflector, with a primary mirror of made polished brass.
The telescope wasn't invented until about 1604, so "early" astronomers had no telescopes.
Ptolemy never saw a telescope. The first telescopes were invented about 1500 years after Ptolemy died.
The first known practical telescopes were invented in the Netherlands at the beginning of the 1600s (the 17th century), using glass lenses.
The first patent application for binocular telescopes was filed early in the seventeenth century by Jan Lippershey in present day Holland.