Happening at OLA

Astronomical Observations

From Tuesday to Saturday at 21h30. 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 faraway galaxies with the help of our telescopes.

Science Café: The beginning of the Universe

Oct 20th, 21h30. The cosmic background radiation allows us to look at the primordial moments of the creation of the Universe. In this presentation, Pedro Gil Ferreira describes the history of how we came to establish the current theory of cosmology where Einstein’s theory of Relativity and the extraordinary capacities of the recent astronomical observatories had a fundamental role.


Activities for Schools

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

Young astronomers – sundials

Saturday the 22nd September, the planed activity is the construction of a sundial where concepts such as solar time, the time on our watch, movement of rotation and translation of our planet are explored.


Equipment Rental

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

Astrophotographer for one night

Night of September 21st to 22nd. During two hours the participants will learn the basic camera definitions that will allow them to acquire night photos. The session will start with a brief theoretical introduction followed by exercises in OLAs field.


European Researchers Night 2018

European Researchers Night at OLA on September 28th

Moonwatching & Stargazing

September 22nd. In cooperation with Nature Park of Noudar (Parque de Natureza de Noudar) and with Portugal Birds & Trails, 3 events have been schedulled at Observatorio do Lago Alqueva – OLA, which allie the astronomical observation with the nocturnal bird migrations


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.

Startrails_20151021_Nuno Santos_OLAA

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
2018/09/27 07:08 - Lua em conjunção com Úrano 4°47'33.8"
2018/09/30 07:33 - Lua em conjunção com Aldebaran -1°24'05.7"
2018/10/02 09:45 - Lua em Quarto Minguante
2018/10/05 22:21 - Lua em conjunção com Regulus -1°52'19.1"
2018/10/05 22:26 - Lua no perigeu 366392.24 km
2018/10/08 00:00 - Chuva de Estrelas Draconidas
2018/10/09 03:46 - Lua Nova
2018/10/11 21:20 - Lua em conjunção com Júpiter -4°06'02.6"
Hoje dia 2018/09/25 (Tempos em UTC)

O Sol nasce às: 06:19:24
no azimute de 90.4°
O Meio-dia Solar ocorre às 12:21:08
com o Sol a uma altura de 50.6°
O Sol põe-se às: 18:22:14
no azimute de 269.4°