How will the thermal regime on the Earth change if the axis of rotation is perpendicular to the plane of the Earth’s orbit?

The boundaries of the heat zones will cease to exist, since at any latitude the Sun will become a rising and setting luminary. The sun will pass through the zenith only at the equator, and at the poles will always be on the horizon (in the absence of an atmosphere). However, as at present, the insolation conditions will monotonically decrease from the equator to the geographic poles.

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