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 – Nocturnal

Saturday, October 13th, the planned activity is the construction of nocturnals, 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.

Astronomer for a night

Night of October 12th to 13th. 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


Astrophotographer for one night

Night of 19th to 20th of October. 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.

Moonwatching & Stargazing

October 27th. 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.

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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
2018/10/16 00:36 - Mercúrio no afélio 0.467 UA
2018/10/16 18:01 - Lua em Quarto Crescente
2018/10/17 19:13 - Lua no apogeu 404227.409 km
2018/10/18 13:02 - Lua em conjunção com Marte -1°56'43.4"
2018/10/20 22:13 - Lua em conjunção com Neptuno 2°30'08.2"
2018/10/21 00:00 - Chuva de Estrelas Orionidas
2018/10/22 00:00 - Chuva de Estrelas Orionidas
2018/10/24 12:31 - Lua em conjunção com Úrano 4°44'14.5"
Hoje dia 2018/10/15 (Tempos em UTC)

O Sol nasce às: 06:38:00
no azimute de 100.2°
O Meio-dia Solar ocorre às 12:15:15
com o Sol a uma altura de 43°
O Sol põe-se às: 17:51:56
no azimute de 259.6°