"data points plotted on the graph are values of solar radiation (insolation) received daily on a horizontal plane at the top of earth’s atmosphere averaged over each month at equatorial, midlatitude, and polar locations. these values come from 22 years of national aeronautics and space administration (nasa) satellite measurements. on figure 1, month of the year is plotted along the horizontal axis and average daily incident radiant energy for each month in kwh/m2/day is plotted vertically. on the horizontal axis, months are identified at mid-month. the annual top-of-the-atmosphere solar insolation curve for the north pole has already been drawn on the graph. "

"on your printed copy of figure 1, draw the annual solar radiation curves for equatorial (0º) and midlatitude (45ºn) locations. draw a smooth curved line connecting the radiation values already plotted for each location (see map legend to identify plotted symbols). "