Look at the picture and answer the following questions. (1) The solar terms represented by each point in the diagram are ① _ _ _ _ _ _; ②______; ③______; ④ _ _ _ _ _.(2) Teacher's Day

Reading the map shows that (1) when the direct point of the sun is on the equator (i.e. position ②) is the vernal equinox or (position ④) the autumn equinox in the northern hemisphere; When the direct point of the sun is on the tropic of cancer (i.e. ① position), it is the summer solstice in the northern hemisphere; When the direct point of the sun is on the tropic of Capricorn (that is, position ③), it is the winter solstice in the northern hemisphere; (2) Teacher's Day is September 10, and autumn is divided into September 23rd. Therefore, on Teacher's Day, the earth is located near 4 o'clock in the orbit of revolution.

So the answer is:

(1) Summer solstice; Vernal equinox; Solstice of winter; Autumnal equinox;

(2)④.