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Thank you Matk, I will send you a note about the purpose of the observation. Of course there is also the unknown cloud in the Mediterranean basin. I hope well.
I’ve seen your planet shots on youtube. Congratulations on everything, Jupiter and Mars are a sight to behold.Yes, real Astronomy is done with stars. Maxim, holy words what you say. It’s just that I am a self builder and I have to put into practice what I do. I’ve also thought about building a small instrument to be operated remotely, but that’s too big an undertaking for me. More seriously, I have fallen back on observing the colours of the sky at sunrise and sunset. I have been practising these observations for three years and from them I can detect the state of transparency of the atmosphere and the ozone in the stratosphere.
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Interesting and great set of observations, for which I envy you. I have always wanted to observe and construct a light curve, at least on an educational level. Instead, from my town, L’Aquila a small town in the mountains of central Italy, the stars have disappeared. Sloppy lighting, headlights pointed everywhere and air pollution have erased them from the sky. Even in the mountains, the gleam reaches halfway up the sky. When I was a boy, 8-10 stars of the Pleiades could be seen with the naked eye.
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Hi David
Try taking it apart, at least opening one side. As I see it, I would think of a lunar visual photometer, based on old schematics.Ciao
Well done and quite meaningful images, yours. Grant, the picture portrays the coloured areas very well, very evident the pinkish VB. The image taken by Nik portrays well the shadow that a mountain casts on the atmosphere and blends in with the Blue Belt. In both images the sky is cloudy below but very clear above. This is an interesting feature, but very rare in my observing locations. Many thanks to you.
Yes, the arc is called Earth’s Shadow, it persists until about 30 minutes after sunset and appears 30 minutes before the sun rises. However, this is not the true Earth’s Shadow, which may be visible, but with great difficulty, as a narrow ‘Dark Segment’ in contact with the horizon, and in any case only from high mountains. The antitwilight phenomenon is generated by the scattering (Rayleigh, and Mie) of sunlight that has passed through the atmosphere, grazing the planet. Therefore, position and intensity of colours contain information about the physical state of the atmosphere down to the synoptic scale (500-1000 km)
I have been systematically observing this phenomenon for about three years. Observation is cheap, easy and interesting. Light pollution and air turbulence do not affect it.
Perhaps, Leonardo da Vinci was the first to attempt a rational explanation of the colours in the sky. The French mathematician de Mairan in his Traité Physique et Historique de l’aurore boréale (page 400) expressed astonishment that such a striking effect, as old as the world, was only mentioned in Joh. Casp. Funccii and not in the books on Physics and Astronomy.The Venus Belt, but also the other structures, appear if the sky is clear and clear around the horizon. Frigid and clear winter days, with a N wind, are the most favourable. All colours are most evident about 10 minutes after sunset (or sunrise). In summer, particularly the current very hot summer, the haze does not allow good observations of the phenomenon.
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Simon
Thank you for your interest in my request.
The observation consists only of simple photographs of the solar disc during the phenomenon. I observe from the city L’Aquila, in central Italy, 100 km east of Roma.
The study I intend to carry out can be found in the attached file.
I will send you a note with some technical details. What is the address @ to which I can send it? Mine is cross19@libero.it
Thanks again.
Cordial greetings
GiovanniYes, the sky in Rome is worse, even the Vatican is brightly lit with headlights pointing upwards. Many people think that lighting is a sign of civilisation.
Hi Robert
The Pyrenees are certainly a beautiful destination for a week’s holiday. I too am planning to go there (maybe in August), walk up, and maybe climb, to the Observatory.
Alternatively, I would recommend the Campo Imperatore Observatory on the Gran Sasso d’Italia at 2130 m above sea level. I live in L’Aquila, a town at the foot of the Gran Sasso, and I go up to the observatory and beyond from the base station of the cable car very often.
Come on, come to Abruzzo, I’ll guide you up to the Calderone glacier and to the western (2912) or eastern (2903 m) summit. These are the highest peaks on the Italian peninsula. Check out youtube and you will be convinced that it is worth it.
In any case, I wish you an excellent holiday.
Greetings
The phenomenon has been known for a long time.
An old description of the phenomenon can be found here:
SAO/NASA Astrophysics Data System (ADS)
Title: Sur les rayons lumineux divergents
Authors: Mascart, J.
Journal: Bulletin de l’Observatoire de Lyon, vol. 9, pp.151-155
Bibliographic Code: 1927BuLyo…9..151M
Since light pollution has erased the stars from the sky above my city, I now study atmospheric phenomena at twilight. I would appreciate some photographs of the sky at sunset or sunrise taken from your residence. If you want, please contact me at this address.
Greetings
Giovanni
L’Aquila city (Italy)
