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.

Moon Total Eclipse and Mars Opposition

On the July 27th, at night fall, the Full Moon will rise eclipsed by the Earth’s shadow, which will make its observation a true challenge! However Mars, which on this night reaches opposition, will help us find the Moon as it rises in a direction close to the Moon at about the same time.


Activities for Schools

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

Perseids 2018

On the nights of August 10th and 11th, come to OLA and follow the Perseids Meteor Shower. Bring with you a jacket and either a blanket or a yoga mattress, and come learn more about Perseids and the Universe while you watch this natural show with us.


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 July 20th to 21st. 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.


Young astronomers

On Saturday July 21st the planed activity is the exploration of two very important concepts to our everyday lives, the Mass and the Weight. How much to you weight on Jupiter? And on Pluto?

Astronomer for a night

August 18th. 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″

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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
2018/07/20 23:56 - Lua em conjunção com Júpiter -4°26'51.3"
2018/07/25 05:53 - Lua em conjunção com Saturno -1°59'56.8"
2018/07/27 02:15 - Marte em Oposição -173°27'28.5"
2018/07/27 05:32 - Lua no apogeu 406222.714 km
2018/07/27 20:20 - Lua Cheia
2018/07/27 20:22 - Eclipse Lunar Total
2018/07/28 00:00 - Chuva de Estrelas Delta Aquaridas
2018/07/29 00:00 - Chuva de Estrelas Delta Aquaridas
Hoje dia 2018/07/20 (Tempos em UTC)

O Sol nasce às: 05:21:06
no azimute de 62.4°
O Meio-dia Solar ocorre às 12:35:51
com o Sol a uma altura de 72.2°
O Sol põe-se às: 19:50:09
no azimute de 297.4°