If the earth's axis was perpendicular to the plane of the ecliptic, insolation would be:

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If the earth's axis was perpendicular to the plane of the ecliptic (i.e., the axis of rotation was perpendicular to the plane of the earth's orbit), the insolation would be the same at all latitudes. In this scenario, the sun's rays would always be directly overhead at the equator, and the angle of incidence would be the same at 45ᵒ north and south latitudes as well. This means that the amount of solar energy received would be the same at all these latitudes, and hence, insolation would be the same.

If the Earth's Axis Was Perpendicular to the Plane of the Ecliptic