noun
- a line on a map connecting points that receive equal amounts of sunshine or solar radiation over a given period.
Usage: technical; geography; meteorology
Examples
- Meteorologists use isohels to map regional variations in sunlight exposure across a continent.
- The isohel patterns in the northern hemisphere shift seasonally as the sun's angle changes.
- Climate researchers compare isohels with temperature data to understand local weather patterns.
- An isohel drawn across the equatorial region shows consistently high solar radiation throughout the year.