Where is the revolution of the earth when there is a phenomenon of extreme night in the Arctic Circle? What solar terms are there in the northern hemisphere at this time?

When the polar night phenomenon occurs in the Arctic Circle, the earth's revolution is in the position of (winter solstice) and in the solar terms in the northern hemisphere; When the sun shines directly on the equator, the revolution of the earth is in the position of (vernal equinox), and the relationship between the termination line and the meridian is (coincidence);

When the day is shortest and the night is longest in the southern hemisphere, the earth's revolution is in the position of (June 2 1).

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