"Rêve"
2018-03-02
Astronomy picture of the day - 2018 March 2 - Alborz Mountain Star Trails
Image Credit & Copyright: Stéphane Guisard (Los Cielos de America, TWAN)
Explanation: Colourful star trails arc through the night in this wide-angle mountain and skyscape. From a rotating planet, the digitally added consecutive exposures were made with a camera fixed to a tripod and looking south, over northern Iran's Alborz Mountain range. The stars trace concentric arcs around the planet's south celestial pole, below the scene's rugged horizon. Combined, the many short exposures also bring out the pretty star colours. Bluish trails are from stars hotter than our Sun, while yellowish trails are from cooler stars. Near the center, the remarkably pinkish trail was traced by the star-forming Orion Nebula.
2018-03-01
Film of Claude Monet painting - 1915 - Peinture impressionniste
This is unique film of French Impressionist painter Claude Monet (1840-1926), painting outdoors, 'en plein air', in his garden at Giverny.
Astronomy picture of the day - 2018 March 1 - The Lunar X (V)
Image Credit & Copyright: Henrik Adamsson
Explanation: The striking X in this lunarscape is easily visible in binoculars or a small telescope, but not too many have seen it. The catch is, this lunar X is fleeting and only apparent in the hours before the Moon's first quarter phase. Along the shadow line between lunar day and night, the X illusion is produced by a configuration of craters seen here toward the left, Blanchinus, La Caille and Purbach. Near the Moon's first quarter phase, an astronaut standing close to the craters' position would see the slowly rising Sun very near the horizon. Temporarily, crater walls would be in sunlight while crater floors would still be in darkness. Seen from planet Earth, contrasting sections of bright walls against the dark floors by chance look remarkably like an X. This sharp image of the Lunar X was captured on February 22nd. For extra credit, sweep your gaze along the lunar terminator and you can also spot the Lunar V.
2018-02-28
Bairros de Lisboa - Igreja de São Miguel, Alfama, Lisboa - Fotos
Igreja de São Miguel, Alfama, Lisboa
A Igreja de São Miguel foi construída entre meados dos séculos XVII e XVIII, mas no local tinha já existido uma velha ermida, construída logo após a conquista de Lisboa aos mouros, em 1147. Era por essa altura uma zona onde os lisboetas se reuniam e que fervilhava de actividade.
O edifício que hoje vemos foi construído sob a orientação do arquitecto João Nunes Tinoco. Sofreu alguns danos aquando do terramoto de 1755, mas logo foi reparada e em 1880 recebeu novas obras de restauro. Classificada como Monumento Nacional desde 1982. Infelizmente encontra-se encerrada ao público, abrindo apenas aos Domingos de manhã e, por vezes, num curto espaço de duas horas às Quartas e Sextas-feiras.
Astronomy picture of the day - 2018 February 28 - NGC 613 in Dust, Stars, and a Supernova
Image Credit: NASA, ESA, Hubble, S. Smartt (QUB); Acknowledgement: Robert Gendler; Insets: Victor Buso
Explanation: Where did that spot come from? Amateur astronomer Victor Buso was testing out a new camera on his telescope in 2016 when he noticed a curious spot of light appear -- and remain. After reporting this unusual observation, this spot was determined to be light from a supernova just as it was becoming visible -- in an earlier stage than had ever been photographed optically before. The discovery before and after images, taken about an hour apart, are shown in the inset of a more detailed image of the same spiral galaxy, NGC 613, taken by the Hubble Space Telescope. Follow-up observations show that SN 2016gkg was likely the explosion of a supergiant star, and Buso likely captured the stage where the outgoing detonation wave from the stellar core broke through the star's surface. Since astronomers have spent years monitoring galaxies for supernovas without seeing such a "break out" event, the odds of Buso capturing this have been compared to winning a lottery.
2018-02-27
Bairros de Lisboa - Largo das Portas do Sol, Alfama - Fotos
Largo das Portas do Sol, Alfama, Lisboa
O Largo das Portas do Sol é um dos pontos que atrai mais turistas em Lisboa. Localiza-se no bairro de Alfama, um dos mais antigos da cidade, e por ele passam os eléctricos da carreira 28, a mais clássica de todas.
O seu nome deve-se a uma antiga porta da cidade que por ali existia à data do grande terramoto de 1755, a que o povo chamava de Porta do Sol.
Para além dos diversos edifícios históricos que ali se encontram, do lado que enfrenta o Tejo está implantado um bonito miradouro com vistas para o rio e para parte de Alfama, com especial destaque para a Igreja de São Vicente de Fora.
2018-02-26
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