Noctilucent clouds in British Columbia

Explore the Night with Bob King

Nights of Noctilucent Clouds

Noctilucent clouds shimmer high in the sky during summer twilight at northerly latitudes.

Crowning glory

Explore the Night with Bob King

Volcanoes Turn Twilights Purple

A rash of unusually colorful sunsets follows in the wake of two major volcanic eruptions. 

Daylight Phenomena

How to See Sirius in the Daytime

Spotting Sirius in broad daylight may be easier than you think! Here's how to do it.

Seeing

Sun

Quest for the Green Flash

If you like sunrises and sunsets, look for the green flash, a phenomenon that happens more often that you think.

Proof you can see Earth's shadow even from a big city

Daylight Phenomena

Earth's Shadow Creeps Up on Us Every Night

The next time you're out watching a sunset, turn around and relish the mighty shadow of Earth looming just behind your back.

Green Ripples

Daylight Phenomena

Catch the Green Flash!

It sounds like a comic-book superhero, but this brief spectacle marks the end of daylight with a burst of color.

Transit of Venus

Daylight Phenomena

Reanimating the 1882 Transit of Venus

Travel 130 years back in time to watch Venus transit the Sun in 1882, thanks to the discovery of 147 forgotten photographs taken by David Peck Todd from Mount Hamilton in California.

Daylight Phenomena

The Transit of Venus: Tales from the 18th and 19th Centuries

Observers and administrators gather at the US Naval Observatory in Washington, DC, in preparation for the American expeditions to the 1874 transit of Venus.Courtesy US Naval Observatory Library. A magnificent rendezvous between the planet of love and the bright orb of the Sun. One of the most celebrated phenomena in…

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