Part 2: Measure the Diameter of the Sun. Make a small, round hole in an index card or piece of
cardboard. It should be around the size of a hole-punch hole. Do not worry if it is not exactly round. Go
outside when the sun is out, and preferably high in the sky. Standing on a flat surface (like a sidewalk),
allow sunlight to pass through the hole you made and land on the ground. (See figure 1.6 in your text
book.) The circle of light you see projected onto the floor is actually an image of the Sun's disk...it would
be round even if you were using a square hole! Holding the card as high above the ground as you can,
measure the distance between the floor and the index card, and the diameter of the image of the sun on
the ground using a measuring tape or ruler. (If you do not have a ruler, use the link to trace or print this
online ruler: https://www.piliapp.com/actual-size/cm-ruler/). Then, using similar triangles, the ratio of the
diameter of the image of the sun to its distance from the card should equal the ratio of the diameter of
the sun to its distance from the card (currently 149,300,000km). This proportion can then be solved for
the diameter of the sun. Pay attention to significant digits in your final result expressing the Sun's
measured diameter. Include a photograph of your set-up (perhaps have a family member photograph
you while projecting the sun's image) in a doc file, along with your data, mathematical work, and result
and submit this document digitally to this page. Remember: to do this measurement, the sun needs to be
out, so be sure to work in the morning, before the clouds hide the sun from view. Please complete this by
Monday.