Day 54: Sun’s Diameter


Astronomy students spent a few minutes outside collecting data for measuring the sun’s diameter. They projected an image of the sun onto mm graph paper and measured the image’s diameter. They knew how far apart the pinhole was from the image. They were also given the distance to the sun. Using the properties of similar triangles they were able to calculate an approximate diameter of the sun. Today’s value was 1.2 million km. Not bad given our method!

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