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Updated: June 22, 2025
I saw at once that there was a signal difference in the two indications, and proceeded carefully to revise the earth-measurements. On the average of thirteen measures the halo was about 87", or nearly 1-1/2' in breadth, the disc, allowing for the twilight round its edge or limb, about 2° 50'. If the refracting atmosphere were some 65 miles in depth, these proportions were correct.
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