Comet Africano in full glory

bob king

Top Ten Ephemeral Sky Sights

The stars may seem eternal, but some of the most amazing sky sights are fleeting phenomena.

Celestial News & Events

What Can Lunar Eclipses Do For Science?

On the night of July 27, 2018, the longest total lunar eclipse for the next 105 years will be visible across parts of Europe, Africa, Asia and Australia. Six months later, on January 20, 2019, there will be the 'Great American' lunar eclipse, where totality is visible across all 50 states.

Astronomy Questions & Answers

What is the Saros Cycle and How Does It Foretell Eclipses?

A slow, relentless rhythm, known as the saros cycle, is hidden away in the movements of the Moon and Sun. How does it foretell eclipses — and how could Babylonians discover its existence long before modern science and technology?

Albert Einstein & James Clerk Maxwell

Famous Astronomers

"Lights All Askew:" How a Solar Eclipse Made Einstein Famous

Why are some scientists world-famous but not others? Narrative, even one as simple as "starlight bends," turns out to be a powerful tool for making sense of science. In 1905 Albert Einstein published four papers that transformed our understanding of light, atoms, space, time, and energy. The world took no…

Stargazer's Corner: Adventures Under the Night Sky

A Teachable Moment: When the Moon's Shadow Came to Angola

A solar eclipse provided the perfect teachable moment in Angola, as students learned about the real sizes and distances of Earth, the Moon, and the Sun.

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