Da Vinci Glow Revealed in a High Dynamic Range of a Crescent Moon


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Featured as Nasa´s APOD – Astronomy Picture of the Day image shows an High Dynamic Range photo of a Crescent Moon, showing in a detailed way the Da Vinci Glow, as well as revealing the bright side of the Moon full of craters with its disk 22,6% directly illuminated by the Sun. Described and drawn for the first time by the great Leonardo Da Vinci about 500 years ago on his book Codex Leicester, Leonardo da Vinci explained the phenomenon known as Earthshine in the early 16th century, when he realised that both Earth and the Moon reflect sunlight at the same time. Light is reflected from the Earth to the Moon and back to the Earth as earthshine. On the bright side is possible to see in the upper part, craters like Hercules and Atlas, while a bit below the lunar Terminator (line dividing light and shadow) is crossing the large Posidonius crater which also marks in the beginning of Mar Tranquilitatis, the place where the last Apollo mission (17) as landed. Below are also visible Mare Crisium, Mare Fecunditatis and Mare Nectaris.

PT: Destacada como Nasa´s APOD – Astronomy Picture of the Day a imagem de Alta Gama Dinâmica (HDR) revela uma lua crescente exibindo de forma detalhada o brilho de Da Vinci, onde simultaneamente é possível observar o lado mais brilhante repleto de crateras, enquanto o disco se encontrava 22,6% directamente iluminado pelo sol. Descrito e desenhado pela primeira vez pelo grande Leonardo Da Vinci há cerca de 500 anos em seu livro Codex Leicester, Leonardo da Vinci explicou o fenómeno conhecido como Earthshine no início do século XVI, quando percebeu que tanto a Terra quanto a Lua refletiam a luz solar ao mesmo tempo. A luz é refletida da Terra para a Lua e volta para a Terra com Earthshine. No lado mais brilhante, é ainda possível distinguir na zona superior, crateras como Hércules e Atlas, enquanto um pouco abaixo o Terminador lunar (linha que divide luz e sombra) cruza a grande cratera Posidonius, que também marca no início do Mar Tranquilitatis, a local onde aterrou a última missão da Apollo (17). Abaixo, são também visíveis os Mare Crisium, Mare Fecunditatis e Mare Nectaris.

Technical details | Detalhes Técnicos

The photo comprises 15 shots at a speed of 1/250s exposure to reveal the bright side in detail, plus 14 shots of 1,60s exposure to reveal Da Vinci glow. The total of 29 pictures were taken in sequence mode at an ISO1250 on 25/06/2020. Taka FSQ-106ED – EM200 auto-guided | Nikon D810a. Cumeada Observatory from Dark Sky® Alqueva Reserve, Reguengos de Monsaraz.

 

 

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