A Moon Glory and a Brocken Spectre Shinning above Dark Sky® Vale do Tua

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Featured as OPOD – Optics Picture of the Day, the image reveals a starry landscape scene from the viewpoint of Ujo and overlooking to the extensive Tua valley and the current reservoir on a moonlit foggy night, while the Waning Moon was laying down behind the mountains, creating a ringed Moon Glory and a Brocken Spectre shadow, as seen on lower center left of this wide panoramic scene. Resembling an iconic saint’s halo, a Glory happens in rare occasions, when the moonlight is interacting with the tiny water droplets that compose mist or clouds. Consisting in one or more concentric rings successively dimming, in which each is red on the outside and bluish towards the centre, it is centered on the antilunar point, coinciding with the shadow of the observer’s head. Since this point is by definition diametrically opposed to the moon’s position in the night sky, it always lies below the observer’s horizon when the moon is up. When viewed from a mountain, glories are often seen in association with a Brocken spectre, also called Mountain spectre, the apparently enormously magnified shadow, cast when the moon or sun is low, on clouds below the mountain on which the viewer is standing. The name derives from the Brocken, the tallest peak of the Harz mountain range in Germany. Captured from Dark Sky® Vale do Tua, recently certified as an International Starlight Tourist Destination located in the northern part of Portugal.

PT: Destacada como OPOD – Optics Picture of the Day, a imagem revela uma paisagem estrelada a partir do miradouro do Ujo e com vista para o extenso Vale do Tua e a sua actual albufeira visível em uma noite de neblina iluminada pelo luar, enquanto a lua minguante se deitava atrás das montanhas, criando um efeito de Glória Lunar e uma sombra do Espectro de Brocken, como pode ser visto na parte central inferior esquerda desta cena panorâmica. Assemelhando-se ao halo de um santo icônico, a Glória acontece em raras ocasiões, quando o luar interage com as minúsculas gotículas de água que compõem a neblina ou as nuvens. Constituída por um ou mais anéis concêntricos que vão sucessivamente escurecendo, em que cada um é vermelho na parte externa e azulado em direção ao centro, está centrada no ponto antilunar, coincidindo assim com a sombra do observador. Como esse ponto é, por definição, diametralmente oposto à posição da lua no céu nocturno, este fica sempre abaixo do horizonte do observador quando a lua está alta. Quando visíveis a partir de uma montanha, as glórias são frequentemente vistas em associação com um espectro de Brocken, também chamado de espectro da montanha, a sombra aparentemente ampliada que se projecta quando a lua ou o sol estão a pouca altura do horizonte, em nuvens que se encontram abaixo da montanha em que o observador está. O nome deriva do Brocken, o pico mais alto da cordilheira Harz na Alemanha. Captada no Dark Sky® Vale do Tua, o destino turístico recentemente certificado como International Tourist Starlight Destination localizado na parte norte de Portugal..


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