> Now
TK: Modeling Heliodon shadow sim + long/lat mapping
Image: CobraGroup-The Crescent Dunes near Tonopah, Nevada
Heliostats nearest to the solar tower are the most efficient as the reflected sunlight has less distance to travel through the air. Also, the nearest heliostats are less prone to shading from their neighbouring heliostats but are affected by the tower. Being nearer, they also require less precise solar tracking of the sun. The power of the reflected solar energy decreases with increasing distance, hence heliostats situated far from the solar tower are less effective. The outer heliostats must be situated farther apart from their neighbouring heliostats to prevent shading.Additionally, they need extremely precise tracking mechanisms to maintain the exact position of the reflected sunlight on the tower.
[Source energymatters.com.au](https://www./renewable-news/solar-power-tower-use-molten-salt-as-an-energy-storage-system/)