Qualche giorno fa ho ricevuto un bel libro di Paul Abel, noto ed esperto osservatore planetario inglese, dedicato all'osservazione visuale dei pianeti e della Luna,
Visual Lunar and Planetary Astronomy, pubblicato da Springer. E' dal 1994 che non usciva una pubblicazione dedicata espressamente a chi fa astronomia planetaria visuale ad un certo livello (l'ultima è stata il
Planet Observer's Handbook di F. Price). Il libro è davvero molto ben fatto, spiega tecniche di osservazione, disegno, raccolta dei dati e si rivolge sia a chi voglia intraprendere seriamente questa attività sia a chi già la pratica da qualche tempo. Riporto qui sotto uno stralcio della presentazione in 4^ di copertina:
"With the advent of CCDs and webcams, the focus of amateur astronomy has to some extent shifted from science to art. The object of many amateur astronomers is now to produce “stunning images” that, although beautiful, are not intended to have scientific merit. Paul Abel has been addressing this issue by promoting visual astronomy wherever possible – at talks to astronomical societies, in articles for popular science magazines, and on BBC TV’s The Sky at Night.
It is believed that imaging and photography is somehow more objective and more accurate than the eye, and this has led to a peculiar “crisis of faith” in the human visual system and its amazing processing power. But by analyzing observations from the past, we can see how accurate visual astronomy really is! Measuring the rotational period of Mars and making accurate lunar charts for American astronauts were all done by eye.
The book includes sections on how the human visual system works, how to view an object through an eyepiece, and how to record observations and keep a scientific notebook. The book also looks at how to make an astronomical, rather than an artistic, drawing. Finally, everything here will also be of interest to those imagers who wish to make their images more scientifically applicable by combining the methods and practices of visual astronomy with imaging."Altre info sul sito web della
Springer.