How to distinguish between extreme day and extreme night?

At the vernal equinox, the sun shines directly near the equator of the earth. At this time, the north and south poles receive the same light range? After the vernal equinox, the sun shines directly in the northern hemisphere, so before the autumnal equinox, that is, from late March to late September, the sun is always at a low altitude in the Arctic. At this time, the North Pole is daytime, which is called extreme day?

At the autumnal equinox, the sun shines directly on the equator, and the light received by the north and south poles is the same? After the autumnal equinox, the direct point of the sun is in the southern hemisphere, so before the vernal equinox, that is, from late September to late March of the following year, it is the night in the Arctic, which is called polar night?

The South Pole and the North Pole are just the opposite. Half a year from the vernal equinox to the autumnal equinox is night, that is, extreme night, while half a year from the autumnal equinox to the vernal equinox is day, that is, extreme day?