Question

Halley's Comet appears every 76 years. What
does this tell us about its orbit?​

Answer 1

Answer:

Halley thus concluded that all three comets were, in fact, the same object returning about every 76 years, a period that has since been found to vary between 74 and 79 years. ... The confirmation of the comet's return was the first time anything other than planets had been shown to orbit the Sun.