the 17th century invented the first telescope in the world.
the 17th century invented the first telescope in the world.
who invented the first telescope in the world?
17th century
although objects resembling lenses date back 4000 years and there are greek accounts of the optical properties of water-filled spheres (5th century bc) followed by many centuries of writings on optics, the earliest known use of simple microscopes (magnifying glasses) dates back to the widespread use of lenses in eyeglasses in the 13th century. the earliest known examples of compound microscopes, which combine an objective lens near the specimen with an eyepiece to view a real image, appeared in europe around 1620. the inventor is unknown although many claims have been made over the years. several revolve around the spectacle-making centers in the netherlands including claims it was invented in 1590 by zacharias janssen (claim made by his son) and/or zacharias' father, hans martens, claims it was invented by their neighbor and rival spectacle maker, hans lippershey (who applied for the first telescope patent in 1608), and claims it was invented by expatriate cornelis drebbel who was noted to have a version in london in 1619. galileo galilei (also sometimes cited as compound microscope inventor) seems to have found after 1610 that he could close focus his telescope to view small objects and, after seeing a compound microscope built by drebbel exhibited in rome in 1624, built his own improved version. giovanni faber coined the name "microscope" for the compound microscope galileo submitted to the accademia dei lincei in 1625 (galileo had called it the ""occhiolino"" or ""little eye"").
microscope
the catalina station site was selected by gerard p. kuiper of the lunar and planetary laboratory (lpl) at the university of arizona in 1960. he believed that a slightly higher location than an alternate site at kitt peak national observatory would be better for lpl's purposes, and mt. bigelow was both higher and easily accessible from the university of arizona via the catalina highway. construction began in late 1962 and the first telescope, a 21-inch reflector, began operating in early 1963. at this time the site was known as catalina observatory. the first telescope was at cs site i, and later in 1963 a 28-inch telescope opened at cs site ii, about to the southeast. in 1965 a 61-inch telescope was opened at site i, followed by two similar 60-inch telescopes at site ii shortly thereafter. in 1969 a 40-inch reflector was erected near site ii, adjacent to a faa transmitter. as a condition for occupying the mount lemmon observatory (mlo) site, the usfs required lpl to vacate site ii, which was completed in 1972. the 40-inch telescope remained until 1975, when it too was moved to mount lemmon observatory. in 1972, a 28-inch schmidt camera replaced the 21-inch reflector. the 61-inch kuiper and the schmidt camera continue to be used today, though they have been upgraded several times. in 1978, the site was transferred from the lunar and planetary laboratory to the steward observatory. in 1989, it was first referred to as the catalina site, and is currently known as the catalina station.
catalina station