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 faraway galaxies with the help of our telescopes.

Science Café: Other Earths in the Universe?

15th of December at 18h30. In this presentation, Prof. Nuno C. Santos (IA/U. Porto) will discuss the topic of hunting for planets around other stars. He will reveal the techniques that astrophysicists use to detect these objects and will discuss the Portuguese participation in this endeavor.

Astrophotographer for one night

On the night of the 29th of December. In just two hours, the participants are introduced and practice in our park the definitions that cameras must have in order to give the first steps into landscape astrophotography.

Astronomy Course I: The solar system

12th and 13th of january. This is the first of three modules coordinated by professor Rui Agostinho. Topics on the formation of the solar system, the life of our star the Sun and the comets will be given. Suitable for all backgrounds and ages.

Astronomer for one night

Night of November 10th to 11th. 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

Young Astronomers – Nocturnal

Saturday the 15th of December, 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.

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 Solar Visibility
2018/12/21 07:57 - Lua em conjunção com Aldebaran -1°40'20.8"
2018/12/21 14:43 - Mercúrio em conjunção com Júpiter -0°51'58.8"
2018/12/21 22:22 - Solstício de Inverno
2018/12/22 17:48 - Lua Cheia
2018/12/24 09:48 - Lua no perigeu 361061.356 km
2018/12/26 12:00 - Vénus no periélio 0.718 UA
2018/12/26 16:31 - Lua em conjunção com Regulus -2°31'00.9"
2018/12/29 09:34 - Lua em Quarto Minguante
Hoje dia 2018/12/18 (Tempos em UTC)

O Sol nasce às: 07:41:00
no azimute de 119.6°
O Meio-dia Solar ocorre às 12:26:03
com o Sol a uma altura de 28.2°
O Sol põe-se às: 17:11:03
no azimute de 240.3°