What would happen if the earth's axial tilt was zero?

Answer 1

Both North and South Poles would forever be exposed to Sun. Sans an extremely small polar caps, there would be constancy of (12+ h) daytime and (12- h) nighttime.

The Sun could be seen from poles at the horizon only, of course, throughout the entire year. The question may seem straightforward, but my response is not. The Sunlit hemisphere of Earth is always slightly larger in surface area than that for the hidden side. Therefore, for zero tilt, the poles would be just within Sunlit hemisphere.

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Answer 2

Alexander Acosta

Seasons would not exist if the Earth's axial tilt was zero, which would lead to a more consistent climate throughout the planet with little variation in temperature throughout the year between different latitudes.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.