Saturday September 16, 2017
Why did the eclipse go west to east when the sun goes east to west? Quirks Question
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- Explainer: North Korea's nukes, missiles and nuclear winter
- Chemotherapy eating bacteria defend cancer
- Recipes for survival in a world with superintelligent artificial intelligence
- No amount of hurricane destruction can change some views on climate change
- Three ways Neanderthals made glue from birch bark
- Why did the eclipse go west to east when the sun goes east to west? Quirks Question
- Full Episode
Carol Yung of Toronto asks: "The sun, from our perspective, travels from east to west across the sky. But when the eclipse happened last month, the geographic path of the eclipse was from west to east. Why was that?"
Jielai Zhang, an astronomer and PhD candidate at the University of Toronto explains that to understand this, you need to think of how the moon orbits the earth, and how its shadow - the eclipse - is cast on the ground and then take into account the rotation of the earth.