In Our Time

Eclipses (Archive Episode)

45 snips
Dec 18, 2025
Join Carolin Crawford, a public astronomer from Cambridge, Frank Close, an Oxford physicist and author, and Lucie Green, a solar physics professor at UCL, as they delve into the mesmerizing world of eclipses. They discuss the mystical cultural myths surrounding eclipses in ancient societies, personal sensory experiences during these events, and groundbreaking scientific discoveries they led to, such as the confirmation of Einstein's theories and the discovery of helium. Discover how eclipses shape our understanding of the universe and inspire both science and awe.
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INSIGHT

Why Total Solar Eclipses Are Rare

  • Total solar eclipses require both a new moon and alignment during narrow eclipse seasons, so they are uncommon at any given place.
  • The Moon's shadow is narrow and races eastward across Earth at over a thousand miles per hour, making totality fleeting.
INSIGHT

The Cosmic Coincidence Of Apparent Sizes

  • The Moon currently appears almost the same size as the Sun because it's ~400 times smaller but ~400 times closer, a temporary coincidence in cosmic time.
  • The Moon is receding slowly, so total solar eclipses will cease far in the future.
ADVICE

Practical Safety And Observation Tips

  • Never look at the Sun outside the total phase; use eclipse glasses or project the image with a pinhole or colander.
  • Observe Bailey's beads and the diamond ring only briefly with proper protection and collect scientific data during totality.
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