To perform its measurement, Mars must be installed outdoors and have a clear view of the sky.
The Mars™ Soiling Sensor performs its measurement each day around sunset. Its measurement sequence begins slightly before sunset and ends once the sky is dark.
Mars™ automatically detects sunset based on light levels in the sky and therefore its exact time of measurement adjusts with the seasons and weather.
To determine the time of sunset for a particular location, please consult a sunrise and sunset calculator, such as this one.
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