As the Northern Hemisphere welcomes spring today, the Southern Hemisphere is marked with the first day of autumn.

Though the meteorological first day of summer is always the same, its astronomical counterpart changes yearly. Here's when it ...

This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year. The ...

However, when the South Pole tilts toward the sun, it's winter in the Northern Hemisphere ... into increasingly longer days until the summer solstice on June 20, the longest day of the year.

On the winter solstice in December ... sunset is in the southwestern sky – a much shorter path across the Northern Hemisphere sky – so days are short and nights are long.

This solstice falls between June 20 and 22.Meanwhile, at the winter solstice, the Northern Hemisphere is leaning away from the sun — leading to the shortest day and longest night of the year.

The Northern Hemisphere’s vernal (spring) equinox can fall between March 19 and 21 while the fall equinox hits sometime between September 21 and 24.