- Student Directions:
- 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
Java sketchpad sketch: Relationship between one sun
angle and the central angle (from Part A).
sketchpad sketch: Relationship between two sun angles
and the central angle (from Part B).
Distance Calculator (back-up):
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