The four seasons in the northern and southern hemispheres are just the opposite, regardless of the specific latitude. Summer in the southern hemisphere is equivalent to winter in the northern hemisphere.

So summer in south latitude 10 is winter, and north latitude 10 is winter.

90 south latitude in summer and 90 north latitude in winter.

If the equator is regarded as a mathematical line, the four seasons on this line can be ignored. If you have to say a season, the accurate statement should be: it is both summer and winter; Or neither summer nor winter. Because the sun's irradiation on the equator in the same season in the northern and southern hemispheres is completely symmetrical.