• Educational Activities for Students

    The educational program for children at Thissio Visitor Center

  • Doridis Telescope

    Doridis Telescope

  • WMO certificate
  • ttod_photo01
  • August

    August 2017 | Photo: Theofanis Matsopoulos


    Julius Schmidt, CHARTE DES GEBIRGE DES MONDES, 1878, ΝΟΑ Library

  • simonvouet English2

    Simon Vouet (1590 - 1649), The Muses Urania and Calliope (1634)

    National Gallery of Art, USA

  • Τηλεσκόπιο Αρίσταρχος English

    Aristarchos Telescope, Helmos Observatory

  • Helmos National Geographic English

    Helmos Observatory, Photography: Harry Katzjaeger
    Source: "Top Shots," National Geographic, June 2012

  • Eskimo Nebula NGC2392 English

    Eskimo Nebula (NGC2392), Aristarchos Telescope, Observer: Dr. Ioannis Alikakos (NOA)

    Digital Image Processing: Theofanis Matsopoulos.

  • Μουσείο Γεωαστροφυσικής English

    Geoastrophysics Museum, Thissio

  • Εκπαίδευση στο ΕΑΑ English

    Summer School in Astrophysics

  • Τηλεπισκόπηση-Γή English

    Remote Sensing & Earth Observation

  • Greece from ISS English

    Greece from the International Space Station

    Photography: Paolo Nespoli, ESA astronaut

  • 3D Sun English

    3D Image of the Sun from the Solar Dynamics Observatory (SDO) mission of NASA.

    Source: NASA's Solar Dynamics Observatory

  • Helicorder English

    Analogue seismograph recorder

  • Geothermal English
  • Παλιρροιογραφος English

    Tide-gauge of the Instittute of Geodynamics at Vlyhada, Santorini.

  • Πειραμα Ulusses English
    Recovered  Ocean Bottom Seismometers on board of research vessel in the frame of the ULYSSES scientific program
  • Meteo historic archive english

    The historic archive of NOA/IERSD with recordings of climatic observations dated from the mid-19th century is one of the oldesr sources of climatic information for Eastern Medirranean.

  • Meteo time-series graph English

    The evolution of the average annual temperature in Athens from the mid-19th century until today, according to the records of the historic station NOA/IERSD (Hill Nymphs Thission).

  • Researchers Night 2014

    Pnyx Hill: Citizens observe the night sky through telescopes of NOA

    Researchers Night 2014

  • Researchers Night 2014

    Pnyx Hill: Citizens observe the night sky through telescopes of NOA

    Researchers Night 2014

Brief Historical Note

The National Observatory of Athens is the first research Institution created in Greece (1842) after its liberation from the Ottoman (1828), the arrival of King Otto as the head of the modern Greek Kingdom (1833) and the establishment of Athens as the capital of the modern Greek state (1834). It followed the establishment of the two other oldest institutions of higher learning in the modern Greek state, the National Technical University of Athens (1836) and the University of Athens (1837).

The construction of the historic Sina's building on the hill of the Nymphs was financed by the Greek entrepreneur and national benefactor Georgios Sinas who was a successful banker in Vienna and ambassador of Greece to Austria. Sinas subsidized not only enterprises but states and royal families in Europe, financed the first permanent connection across the Danube between Buda and Pest, which is used even today and his name is inscribed on the base of the south western foundation of the bridge on the Buda side.

The original Observatory building was designed by the renouned Danish Architect Theophilus Hansen, who also designed the Cathedral of Athens (1842) and two of the three contiguous buildings forming the so-called "classical trilogy", namely the Academy of Athens and the National Library of Greece. The third building of the trilogy, the National and Kapodistrian University of Athens, was designed by his brother Christian Hansen. Theophilus Hansen is considered an outstanding representative of neoclassicism. Besides his works in Athens, he is one of the most important and influential architects of the Viennese Ringstraße. His most famous work is the Austrian Parliament building, which was created in the style of an ancient, neo-classic temple, and serves to refer to the Greek beginnings of democracy. Hansen's famed Musikverein in Vienna is one of the most notable concert halls in the world; a concert hall whose design and acoustics are often admired and copied in present-day music houses.

The hill of the Nymphs, selected as the place to build the Observatory, is one of the seven hills of Athens, a sanctuary of the Nymphs in antiquity. It is also next to the Pnyka hill where one of the early Observatories of the 5th century was located and where Meton’s Heliotropion was placed. The hill of the Nymphs is aligned with one of the most celebrated and best preserved meteorological/astronomical observatories, the Tower of the Winds, also the emblem of the Royal Meteorological Society. A rough copy of this Tower was built at the University of Oxford.

The National Observatory of Athens facing the Parthenon and Thission is one of the landmarks of Athens; it has long been used by Greek and foreign Astronomers as the basis for astronomical, meteorological, chartographical and geodynamical measurements and observations in the more than 170 years long course of its history. Today the buildings of NOA at Thission include an Astrogeophysics Museum, housing clocks, telescopes and other instruments of the 19th century, as well as an extensive 19th century library. The activities of the National Observatory of Athens are organized in 3 research Institutes: the Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing, the Institute of Environmental Research and Sustainable Development, and the Geodynamics Institute. Besides basic and applied research and services to the society, these Institutes provide the facilities for graduate student training in collaboration with other Greek and foreign Universities. NOA hosts the UNESCO Chair for Natural Disasters and the Greek Focal Point of the Global Earth Observing System of Systems (GEOSS), operates the National Seismological Network, participates in the OPTICON and other international research networks, etc.





Mon Tue Wed Thu Fri Sat Sun

Penteli Visitor Center
Thissio Visitor Center
Educational program on Meteorology
Multiple Events

Real Time Seismicity

Institute of Geodynamics
seismografoi thumb

Weather Forecast


View the latest weather forecasts, maps, and alerts for Greece on meteo.gr


The Sky Today


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