Sky - 10 shots ,F2 , 15" , ISO 1000 stacked and blended for noise reduction and improvement of stars colors
Foreground - 3 shots , F2 , 30" , ISO640 light painted
Overlays of the six constellation added on top of final image as a pedagogic information
Sky and Foreground blended in Photoshop

The composition was planed to catch the Great Winter Circle in a early stage of its ascension just behind the abandoned mining ruins of Achada do Gamo , Mina São Domingos , Portugal
We can clearly see Sirius in Great Dog near the chimney on the right side , just bellow Orion and on top of the image the planet Mars near Aldebaran in Taurus