The earth's tilt in its axis of rotation results in longer days, ie: more sunlight, for six months for each hemisphere, north and south. In the middle latitudes, the sun is overhead of countries, like the US, so even more solar energy is received in the summer months. With summer in the northern hemisphere, now is the time to maximize the amount of solar energy (kilowatt-hour) generated per square area of photovoltaic panels. ...
... "Scientists measure the amount of sunlight falling on specific locations at different times of the year. They then estimate the amount of sunlight falling on regions at the same latitude with similar climates. Measurements of solar energy are typically expressed as total radiation on a horizontal surface, or as total radiation on a surface tracking the sun. Radiation data for solar electric (photovoltaic) systems are often represented as kilowatt-hours per square meter (kWh/m2). " ...Via Energy Savers: Solar Radiation
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