In today's image, we see three different paths taken by our Sun over the course of the year. The lowest and shortest path is at the winter solstice. The highest and longest path is at the summer solstice. The intermediate path would be for the equinoxes. The changing altitude of our Sun and the change in the amount of time it spends in the sky during the day is what causes our changing seasons.

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This Podcast is an authorized New Media Mirror Site for APOD. You can access the image and website directly at: Astronomy Picture of the Day. You can use the archive link below the image to select the photo corresponding to the date of this podcast.

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