Astronomical Instrument

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Australian Astronomical Observatory (AAO)

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Observational astronomy is a division of astronomy that is concerned with recording data about the observable universe, in contrast with theoretical astronomy, which is mainly concerned with calculating the measurable implications of physical models. It is the practice and study of observing celestial objects with the use of telescopes and other astronomical instruments.

Galileo Galilei turned a telescope to the heavens and recorded what he saw. Since that time, observational astronomy has made steady advances with each improvement in a variety astronomical instruments and related methods. — Wikipedia

Observational Astronomy (Eric Weisstein’s World of Astronomy, Wolfram Research)
Observatories & Telescopes (Wolfram Alpha)
Encyclopædia Britannica

Astronomical Instruments, Category (Wikipedia)
Astronomical Instruments, List (Wikipedia)




Galileo and the telescope (The Science Geek)
The History of Astronomy (Ask an Astronomer, Cornell University)


Smithsonian National Air and Space Museum


WorldCat, Library of Congress, UPenn Online Books, Open Library




Telescopes (NASA.Gov)
Observational Astronomy (Ask an Astronomer, Cornell University)
Telescopes (Ask an Astronomer, Cornell University)
Telescopes (Cosmos4Kids)


Crash Course Astronomy (YouTube)

OER Commons: Open Educational Resources



Careers in Astronomy (Ask an Astronomer, Cornell University)


Sky & Telescope, ScienceDaily,, NPR Archives







Acapella Science (YouTube Channel)


More News …

Celestial News & Events – Sky & Telescope The essential guide to astronomy

  • Solar and Lunar Eclipses in 2022
    by J. Kelly Beatty on January 21, 2022 at 3:05 pm

    Although no total or annular solar eclipses occur this year, skywatchers can look forward to two total lunar eclipses — the first ones observable across North America in more than 3 years. The post Solar and Lunar Eclipses in 2022 appeared first on Sky & Telescope.

  • This Week's Sky at a Glance, January 21 – 29
    by Alan MacRobert on January 21, 2022 at 10:11 am

    As Jupiter gets lower now, Orion and Gemini rise high, the Winter Triangle pivots on Sirius, the Great Square sinks and the Big Dipper creeps up. The post This Week's Sky at a Glance, January 21 – 29 appeared first on Sky & Telescope.

  • Set Your Sights on This Lunar Bull’s-Eye
    by Bob King on January 19, 2022 at 5:48 pm

    Go ahead, live on the edge: Grab your chance this month to see Mare Orientale, one of the most spectacular lunar seas most people have never seen. The post Set Your Sights on This Lunar Bull’s-Eye appeared first on Sky & Telescope.

  • Watch an Asteroid Race Across the Sky
    by Bob King on January 14, 2022 at 3:30 pm

    The kilometer-wide, potentially hazardous asteroid 1994 PC1 will fly past Earth on January 18th. Good news on two counts: It won't hit us, and it's bright enough to see in a 4-inch telescope. The post Watch an Asteroid Race Across the Sky appeared first on Sky & Telescope.

  • This Week's Sky at a Glance, January 14 – 22
    by Alan MacRobert on January 14, 2022 at 9:52 am

    Jupiter stands alone at dusk. The Moon dances with Castor and Pollux while Iris creeps in the background. And you can't keep Venus down for long; its tiny crescent reappears at dawn. The post This Week's Sky at a Glance, January 14 – 22 appeared first on Sky & Telescope.

Space Telescopes News -- ScienceDaily Space Telescopes. Astronomy articles and pictures from NASA's Hubble Space Telescope and Chandra X-Ray Telescope and many other leading astronomy institutes from around the world.

  • Scientists make a new type of optical device...
    on January 27, 2022 at 3:39 pm

    Researchers have developed an alumina short-wavelength absorber patterned with moth eye-like structures. These new anti-reflective structures will improve the performance of telescopes studying radiation from the Big Bang.

  • Mysterious object unlike anything astronomers...
    on January 26, 2022 at 5:24 pm

    A team mapping radio waves in the universe has discovered something unusual that releases a giant burst of energy three times an hour, and it's unlike anything astronomers have seen before. Spinning around in space, the strange object sends out a beam of radiation that crosses our line of sight, and for a minute in every twenty, is one of the brightest radio sources in the sky.

  • Extraordinary black hole found in neighboring...
    on January 24, 2022 at 8:10 pm

    At one hundred thousand solar masses, it is smaller than the black holes we have found at the centers of galaxies, but bigger than the black holes that are born when stars explode. This makes it one of the only confirmed intermediate-mass black holes, an object that has long been sought by astronomers.

  • Sidewinding young stellar jets spied by Gemini...
    on January 21, 2022 at 9:55 pm

    Sinuous stellar jets meander lazily across a field of stars in new images. The gently curving stellar jets are the outflow from young stars, and astronomers suspect their sidewinding appearances are caused by the gravitational attraction of companion stars. These crystal-clear observations were made using the Gemini South telescope's adaptive optics system, which helps astronomers counteract the blurring effects of atmospheric turbulence.

  • Hubble finds a black hole igniting star formation...
    on January 20, 2022 at 12:41 am

    Often portrayed as destructive monsters that hold light captive, black holes take on a less villainous role in the latest research from NASA's Hubble Space Telescope. A black hole at the heart of the dwarf galaxy Henize 2-10 is creating stars rather than gobbling them up. The black hole is apparently contributing to the firestorm of new star formation taking place in the galaxy. The dwarf galaxy lies 30 million light-years away, in the southern constellation Pyxis. - latest science and technology news stories internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • NASA's TESS hits milestone of 5,000 exoplanet...
    on January 21, 2022 at 3:14 pm

    The catalog of planet candidates found with NASA's Transiting Exoplanet Survey Satellite (TESS) recently passed 5,000 TOIs, or TESS Objects of Interest.

  • LAMOST reveals secret of stellar rotation of hot...
    on January 21, 2022 at 3:02 pm

    Stars all rotate, but at different rates. Stellar rotation profoundly affects almost every aspect of stellar evolution. But the evolution of the angular momentum remains a mystery.

  • Alpha-rich 'young' stars are actually not young
    on January 21, 2022 at 2:59 pm

    The alpha-rich giant stars with theoretical young ages have been treated as an abnormal population, since they cannot be understood in the canonical scheme of the Galactic chemical evolution.

  • Astronomers focus robotic eyes on the Milky Way,...
    on January 21, 2022 at 2:50 pm

    Thanks to a breakthrough robotic innovation, an international collaboration that includes the University of Toronto has advanced the Sloan Digital Sky Survey (SDSS), a 20-year-long research project that has been investigating the structure and evolution of our cosmic home, the Milky Way galaxy.

  • Sidewinding young stellar jets spied by Gemini...
    on January 20, 2022 at 6:11 pm

    Young stellar jets are a common by-product of star formation and are thought to be caused by the interplay between the magnetic fields of rotating young stars and the disks of gas surrounding them. These interactions eject twin torrents of ionized gas in opposite directions, such as those pictured in two images captured by astronomers using the Gemini South telescope on Cerro Pachón on the edge of the Chilean Andes. Gemini South is one half of the international Gemini Observatory, a Program of […]


Here are links to pages about closely related subjects.

Knowledge Realm


Law (Constant) Relativity
Force Gravity, Electromagnetism (Light, Color)
Matter (Microscope) Molecule, Atom (Periodic Table), Particle

Universe (Astronomical Instrument)
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Our Neighborhood
Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.