Helios Sun Position Calculator


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 with natural light, Helios is essential to anyone who needs to plan a day around the constantly changing character of sunlight. 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 Surveyors to Electricians and Landscape Gardeners can now predict sun exposure in the field, without the need for complex tables or graphs. With the addition of the magnetometer in the new Phone 3Gs both compass and inclinometer functionality are fully integrated within Helios.

Please watch the video on our site for a full demonstration.

Helios operates in 4 modes:

HelioMeter is a graphical representation of the sun's predicted position on a compass dial (azimuth) for any time of day, showing the sun's elevation and proportional length of shadow an object would cast. In the iPhone 3Gs, the compass is fully functional.

Skyview represents the sun's path in the sky through the day in question. You can also use the compass in this view.

Inclinometer View shows the sun's elevation at any given time in the day. Essentially an electronic inclinometer that reads in both time and angle.

Raw Data table provides numerical information where figures are preferable. This data can be sent via email from within Helios.

Helios has an internal database of over 30,000 locations around the world, providing longitude, latitude, timezone and daylight savings information. There is an ability to save favorite locations and add the current location from GPS data (where available). Core functionality is not reliant on cellphone reception. Likewise Helios will work on the iPod Touch though you have to select a nearest location from the database or manually enter the GPS coordinates.

Utilizing algorithms created by the National Renewable Energy Laboratory and The National Geophysical Data Center to predict the sun's movement (including nutation offsets) and magnetic declination, Helios is accurate to a tiny fraction of a degree.

With the addition of a magnetometer to the iPhone 3Gs, Helios now takes advantage of the new compass functionality. Like all compasses, the iPhone 3Gs is subject to magnetic interference. Please be sure to account for any magnetic or metallic objects near your iPhone when using Helios. In particular, make sure your iPhone case does not contain tiny magnets or metal components. Check the accuracy of your iPhone's magnetometer against a hand held compass, in and out of it's case. It is most likely that the accuracy of a high quality compass like the Suunto Tandem may exceed that of the iPhone. Please take the time to check and be aware of the limitations of the tiny 4mm square, 0,7mm thick magnetometer chip hidden within the iPhone.