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

It is the angle of the Earth's tilt that causes the seasons: spring ... Figure caption, It is winter in the UK when Earth’s northern hemisphere is tilted away from the Sun.

The Earth’s tilt is the reason for the changing seasons. The top half of the Earth we call the northern hemisphere, and the bottom half we call the southern hemisphere. At this point in the ...

Thursday is the first day of spring, or the vernal equinox, in the Northern Hemisphere ... autumnal equinox occurs in September – when the Earth's axis is tilted neither toward nor away from ...

The vernal equinox arrives on Thursday, marking the start of the spring season for the Northern Hemisphere and ... While astronomical seasons depend on how the Earth moves around the sun ...

Earth's axis will be side-on to the sun, meaning there will be more daylight in the Northern Hemisphere from then until ...

Maps detail NASA's study The sun is directly above the equator during both equinoxes. We experience the longest day of the year on the summer solstice. That's when the Northern Hemisphere is at ...