Happening at OLA


Astronomical Observations

From Tuesday to Saturday, at 18h30. Learn to find the polar star, identify the constellations and know their legends, relate stellar colours with their ages, observe star clusters, nebulas and faraway galaxies with the help of our telescopes.

Young astronomers

Saturday 2nd of December. Construction of Spectroscopes. Questions such as the nature and composition of light are explored, as well as the information that is possible to extract from the analysis of stellar light.


Activities for Schools

Check here the available activities for schools, from the 1st grade up to the 12th grade.

Young Astronomers

Saturday the 9th December. Construction of nocturlabes, simple instruments that allow one to know the time by the observation of the Ursa Minoris Constellation (also known as Small Dipper, Small Bear, etc). There are also explored questions such as the Earth rotation, the origin of day and night and the orientation by the Northern Star.


Equipment Rental

The observatory offers a wide range of astronomical equipment for rental, such as telescopes, mounts and cameras.

Science Café – The sky in our mouth

18th November at 18:30. Presentation on the etymology of common words and their relation with astronomy.


Astronomer for a night

15th December. Follow the usage of OLA's main telescope and in the end, take the pictures with you. Learn more about astronomy and astrophotography, in this activity where our guests are the on-duty astronomers

Science Café – Nobel prize in Physics 2017

9th of December. The discovery of gravitational waves is one of the last pieces confirming Einstein's theory of gravitation. Professor Francisco Lobo will give us a brief historical revision of this amazing discovery and discuss its importance.

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″

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

Observation Dome

This is the structure that houses the main telescope of the observatory. The quality of the telescope here installed enable us to acquire images of great quality and beauty

Conjuctions Solar Visibility
2017/11/26 17:02:56 - Lua em Quarto Crescente
2017/11/27 05:18:20 - Lua em conjunção com Neptuno 1°09'04.1"
2017/11/28 09:27:47 - Mercúrio em conjunção com Saturno 3°03'17.4"
2017/11/30 09:35:47 - Lua em conjunção com Urano 4°18'58.9"
2017/12/03 15:46:59 - Lua Cheia
2017/12/04 08:56:46 - Lua no perigeu 357491.75 km
2017/12/06 11:31:38 - Mercúrio em conjunção com Saturno 1°20'45.7"
2017/12/10 07:51:21 - Lua em Quarto Minguante
Hoje dia 2017/11/25 (Tempos em UTC)

O Sol nasce às: 07:20:28
no azimute de 116°
O Meio-dia Solar ocorre às 12:16:32
com o Sol a uma altura de 31.2°
O Sol põe-se às: 17:12:18
no azimute de 243.9°