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The oldest form of astronomy, optical or visible-light astronomy, observes wavelengths of light from approximately 400 to 700 nm. [149] Positioning an optical telescope in space eliminates the distortions and limitations that hamper that ground-based optical telescopes (see Astronomical seeing ), providing higher resolution images.
Telescope History Archived 2021-02-14 at the Wayback Machine, NASA Official Website, accessed 02/09/2019; History of the Telescope, accessed 02/09/2019; List of astronomical observatories and telescopes, Encyclopedia Britannica, 02/09/2019
This is a list of radio telescopes – over one hundred – that are or have been used for radio astronomy. The list includes both single dishes and interferometric arrays. The list is sorted by region, then by name; unnamed telescopes are in reverse size order at the end of the list. The first radio telescope was invented in 1932, when Karl ...
Thirteen Towers solar observatory, Chankillo, Peru Antikythera Mechanism, a geared astronomical computer that calculates lunar and solar eclipses, the position of the Sun and the Moon the lunar phase (age of the moon), has several lunisolar calendars, including the Olympic Games calendar.
Astronomical observatories are mainly divided into four categories: space-based, airborne, ground-based, and underground-based. Many modern telescopes and observatories are located in space to observe astronomical objects in wavelengths of the electromagnetic spectrum that cannot penetrate the Earth's atmosphere (such as ultraviolet radiation ...
This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes . This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.
List of largest optical reflecting telescopes – List of large optical telescopes; List of largest optical refracting telescopes; List of space telescopes; List of solar telescopes; List of telescope types; List of largest optical telescopes historically; List of largest optical telescopes in the 20th century
Optical Telescopes (List by Historical Significance) Name: Aperture: Type: Significance: Location: Year Meter: Inch: James Webb Space Telescope: 6.5 m: 256" Beryllium mirror reflector – Segmented, 18: Largest space based telescope: Sun–Earth L2 orbit: 2021 Gran Telescopio Canarias (GTC) 10.4 m: 409" Reflector – Segmented, 36: World's ...