Happening at OLA

Astronomical Observations

From Tuesday to Saturday at 18h30. During this two hour session, learn to find the polar star, identify the constellations and know their legends, relate stellar colours with their ages, observe star clusters, nebulas and distant galaxies with the help of our telescopes.

Astronomical Saturdays

Every Saturdays afternoon, from 16:30 to 17:30, OLA offers activities for children where the young astronomers learn more about science and astronomy in an entertaining and relaxed way. Verify here the calendar of activities


Science Café: 100 years of gravitational lenses

9th March at 18:30. Dr Ismael Tereno (IA)presents the phenomenon and discusses the several types of gravitational lenses that we know in the Universe. It will also describe some applications of gravitational lenses that have been contributing to the advance of our understanding of the Universe and in particular the ones used by the space mission Euclid.

Astronomy Course III: Astronomical Observations

2nd and 3rd of March. In this module the apparent motions of the celestial sphere, the constellations, measurement of angles in the sky and techniques for observing astronomical objects will be explored.


Landscape Astrophotography Workshop

30th and 31st of March.Landscape Astrophotography Workshop coordinated by Outside Astrophotography and directed by Soraia Piedade and Miguel Marques.

Amateur Astronomers Meeting and Messier Marathon

6th April. In this night we set ourselves to observe through the telescope the maximum possible number of galaxies, nebulae and open and globular clusters from the 110 objects belonging to the Messier catalog built by Charles Messier, the french astronomer of the 18th century.


Activities for Senior Groups

The observatory offers a wide range of astronomy related activities having the seniors in mind.

Activities for Schools

The observatory offers a wide range of astronomy related activities having the school programs in mind, from elementary to high school.


Observatório do Lago Alqueva - OLA

Located inside of the Dark Sky Reserve in Alentejo, OLA aims that our visitors find a pleasant place to discover the Universe and learn more about Astronomy and astrophotography, in one of the areas of Europe most protected against the light poluttion of big cities.


Email: geral@olagoalqueva.pt Tel: (+351) 960 361 906 GPS: N 38 ° 26′ 35.5″ W 7 ° 22′ 01.5″

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Main Building

Houses the reception and shop, the bookshop and the auditorium. It has a dome with a telescope for the night sky observations. The visitors can enjoy the view onto the Alqueva lake and village of Monsaraz. On the foreground the sundial where one can learn how to measure the local time from the direction of hour shadow.

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Observation Platforms

The observation platform is located at the center of the observatory field. It is used as a support structure for large groups of astronomers and has a central role on the organization of star parties. It consists of a solid surface where tripods and pillars can be installed for telescopes and binoculars as well as other support equipment and with access to the electricity grid.


It is the main room where events such as talks, courses, workshops or even concerts happen. There are always two photography exhibitions displayed from either young or well known authors. It is possible to rent the auditorium for meetings, conferences or anniversary parties.

Equipment rental

The observatory offers a wide range of astronomical equipment for rental, such as telescopes, mounts and cameras. Click here to know more.

Conjuctions and Lunar phases Solar and Lunar Visibility