"Earth's axis was vertical before the Flood."
There is no basis for this claim. Seasons are mentioned in Genesis 1:14 before the Flood, which strongly suggests
an axial tilt from the beginning. Some creationists believe that a change in
axial tilt (but not from the vertical) started Noah’s Flood. But a lot more
evidence is needed and this idea should be regarded as speculative for now.
Furthermore, computer modeling suggests that an upright axis would make
temperature differences between the poles and equator far more extreme
than now, while the current tilt of 23.5° is ideal. The moon has an important
function in stabilizing this tilt, and the moon’s large relative size and the
fact that its orbital plane is close to the earth’s (unlike most moons in our
solar system) are design features.
Source: Answers in Genesis
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