The Spy Balloon's size

The mentions that the size of the balloon is about 130 ft. based on the U2 plane's shadow on the balloon.

The balloon, however, isn't quite spherical. Using the U2 length of 63 ft. I estimate the balloon to be a 150 ft. in width and about 135 ft. in height.

This is less than I had assumed when calculating its brightness, which, admittedly, was a very rough guess.
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