Length of Days The first graph shows how the number of hours
from sunrise to sunset change on different locations. Data for
two years is shown. The second graph shows how much the the day-
length changes, in hours, each day. (The first derivative of the
above.) Select which locations to show: (Tip: Turn off all
except Quito to see how little variation in day length there is
at the equator) Show custom location You can add graph for a
custom location by providing a latitude/longitude coordinate set
below. You could use touch map to find the coordinates.