If June 21 is the longest day of the year here on this side of the earth. What is the shortest day of the year on the other side of the earth? Is it the same day the 21st? or Is it the 19th, is it the 20th. is it the 22nd
Seeing as the solstice is a function of the axial tilt of the planet, the summer solstice in the northern hemisphere and the winter solstice on the southern hemisphere (or vice versa) is always on the same date. The date itself might move to the 20th of June (or December) in certain years, but it’s always on the same date all over globe. (The same thing applies to the equinox as well.) Solstice - Wikipedia