Scientists at the University of California, Berkeley, have watched our planet's seasons from space and discovered that spring, summer, winter, and fall are surprisingly out of sync.

44 degrees, or about half way between its extremes, and this angle is very slowly decreasing in a cycle that spans about 41,000 years. 5 degrees relative to its orbital plane around the sun, is the primary cause of the seasons. Think of Earth like a ...

At the Northern Hemisphere’s winter solstice the upper half of the Earth is at its furthest lean away from the sun — leading to the shortest day and longest night of the year. The winter solstice falls can fall between Dec. 20 and 23 — this year it’s the 21st.