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"Climate and Earth’s Energy Budget : Feature Articles." Climate and Earth’s Energy Budget : Feature Articles. N.p., n.d. Web. 29 Mar. 2016. http://earthobservatory.nasa.gov/Features/EnergyBalance/.
The above graph shows the solar insolation (amount of solar energy over a given surface area of Earth) at various latitudes on the Earth at different times of the year. Each line is a different latitude.
Which line represents the equator?