On this day, the solar terms in the northern hemisphere are

Look at the map and it shows (1) that the sun shines directly on the tropic of cancer, which is the summer solstice in the northern hemisphere, and the date is around June 22nd.

(2) The sun shines directly on the Tropic of Cancer. At this time, the days in the northern hemisphere are long and the nights are short;

(3) The sun shines directly on the Tropic of Cancer, and it is winter in the southern hemisphere.

So the answer is: (1) 6; 22; Summer solstice; (2) The days are long and the nights are short; (3) Tropic of Cancer; winter