Could we enjoy starry skies in our cities again? Arguably yes. The actual number of visible stars will depend, among other factors, on the spatial density overall city light emissions. In this paper it is shown that reasonably dark could be achieved urban settings, even at center large metropolitan areas, if emissions are kept within admissible levels and direct glare from sources avoided. Thes...

A total lunar eclipse is conjectured to have influence on the physical conditions of an environmental area, particularly on the brightness of the sky. The phenomenon might also be relevant on weather parameters change on Earth, such as temperature, humidity and pressure, though a straightforward correlation is not easy to establish. This work mainly aims at measuring the brightness of the sky a...

Flying animals use aerial habitats to forage, communicate and travel. However, human activities that fragment habitat with built structures, noise, chemical or light pollution, may limit the ability of wildlife airspace efficiently. Applying landscape connectivity theory could reveal how long-distance migrants respond sources fragmentation along their migratory routes. Artificial at night is a ...