Happening at OLA


Astronomical Observations

From Tuesday to Saturday, at 21h30. 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: Special Relativity, General Relativity and Gravitational Waves

June 16th, at 21h30. We will discuss the most salient aspects of the Special and General Relativity Theories and, in particular, the discovery of gravitational waves. We will also see how modern cosmology was born in 1917, when Einstein considered the problem of space-time or of the Universe as a whole as an application of his General Relativity Theory, formulated in the end of 1915.

Activities for Schools

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

Astrophotographer for one night

June 23rd. 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 OLA’s field.


Equipment Rental

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

Astronomy Course III: From the Big Bang to the galaxies

June 30th. This is the third of three modules coordinated by Nelson Nunes (IA/U. Lisbon and OLA). This session will be focused on Cosmology, the evolution of the Universe and the formation of structure.


Young astronomers – Target shooting

On saturday, May 19th, 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.

Astronomer for a night

Night of June 15th to 16th, Follow the usage of OLA’s main telescope and in the end, take the pictures with you. Learn more about Astronomy and Astrofotography, in this activity where our guests are the “on duty” astronomers!

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.

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

ConjuctionsSolar Visibility
2018/05/29 14:19 - Lua Cheia
2018/06/01 01:04 - Lua em conjunção com Saturno -1°38'13.0"
2018/06/02 16:36 - Lua no apogeu 405316.825 km
2018/06/03 12:00 - Lua em conjunção com Marte -3°09'54.4"
2018/06/06 02:56 - Mercúrio em conjunção superior 0°44'42.1"
2018/06/06 04:56 - Mercúrio no periélio 0.308 UA
2018/06/06 17:33 - Lua em conjunção com Neptuno 2°26'19.0"
2018/06/06 18:31 - Lua em Quarto Minguante
Hoje dia 2018/05/24 (Tempos em UTC)

O Sol nasce às: 05:11:11
no azimute de 62.3°
O Meio-dia Solar ocorre às 12:26:18
com o Sol a uma altura de 72.4°
O Sol põe-se às: 19:41:51
no azimute de 297.8°