If you’re lucky enough to be watching the eclipse, notice how chilly it gets as the Sun becomes blocked by the Moon. It gives you a firsthand sense that the Sun is a major part of Earth’s climate system. But is the Sun causing today’s climate warming? Nope! NASA data show there has been no upward trend in the amount of solar energy reaching our planet. Any significant change in the amount of solar radiation reaching Earth can change the climate. For example, small variations in Earth’s orbit cau