Content Material
 Student Directions:
 Graphics:
 Graphic A: The
central angle between the two cities equals the difference
of the two sun angles.
 Graphic B: The
central angle equals the sum of the two sun angles when the
cities are on opposite sides of the sun's zenith.
 Graphic C:
How to use trigonometry to calculate the sun angle.
 Graphic D:
How to calculate the circumference of the earth.
 Referenced URLs & Java
sketchpad sketches:

Java sketchpad sketch: Relationship between one sun
angle and the central angle (from Part A).

Java
sketchpad sketch: Relationship between two sun angles
and the central angle (from Part B).

Distance Calculator (backup):
Use to enter the geographic location of each of the cities and the
longitudinal point on the equator (lat., long.) to determine the
distance to the equator.
 Help Files:
(NOTE: this RWLO is
based on the Noon Day
Project)
