The winter solstice is fast approaching. But what is the solstice? Here’s a little background to get you started. The Earth revolves around the Sun in an elliptical orbit. One revolution takes 365 days or one year. The Earth rotates as it revolves. One rotation takes 24 hours. Although we are closer to the Sun at some points during our orbit than others, this is not what causes changes in our weather patterns or seasons. Seasons are affected by Earth’s tilt. Yes, Earth is tilted on its axis by 23.5 degrees, so as it travels in its orbit around the Sun, there are times when the Northern Hemisphere is tilted toward the Sun and times when the Southern Hemisphere is tilted that way. Earth’s tilt is what gives us our different seasons.