Turning on and off at the right time means making the most of natural light so as not to waste energy. It also means meeting the needs of daily migrations in winter at the very beginning or at the end of the day, when natural lighting is lacking.
A patented astronomical calculation was invented by BH Technologies to take into account the fact that the moments of ignition are more critical in winter at busy times, than in summer when the days are longer. The astronomical clock follows the rhythms of the seasons to offer adapted switches each day of the year.
To be precise, an astronomical calculation needs location, date and time information to switch lighting precisely according to the season. If the astronomical clock is not on time, its switching will be fanciful and it will be impossible to seek a minimum ignition time without harming the safety of local residents.