Helios is a Sun Position Calculator that graphically represents the position of the sun from dusk to dawn, on any given day, in any given place. Designed as an aid to Cinematographers and Stills Photographers working in natural light, Helios is essential to anyone who needs to plan a day around the constantly changing character of sunlight. Helios works without a network connection, though some functions are enhanced when connected to the internet. This app retails for $29.99/£20.99 and you can download it here.   Gaffers, Grips, Location Managers, Production Designers and First Assistant Directors will already be aware of the value of this information. Other professionals, from Architects and…