Positioned around or near the meridian; relating to regions around the noon-sun position.
From circum- and meridional (relating to the meridian or to the south, from Latin meridionalis). A less common variant of circummeridian.
Solar panels are most efficient in circummeridional positions—they generate peak power when the sun crosses the meridian (true south in the Northern Hemisphere), which is why installers obsess over precise orientation.
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