Blog

Ten cities with iconic sunrise photography opportunities — from New York to Sydney — with the best vantage points and timing.

At polar latitudes, sunrises can last for hours. Here are the best places in the world to watch them and how to plan a trip.

Equatorial sunsets feel sudden — the sun drops fast. High-latitude sunsets linger for an hour. Here's the geometry behind the difference.

The equinox is when day and night are roughly equal. But "exactly equal" happens on different days — here's why.

Where and when to see the northern lights — the science of auroras, best months, and how sunset times affect your viewing.

Blue hour is the brief window after sunset when the sky turns deep saturated blue. Here's why and how photographers capture it.

Above the Arctic Circle in summer, the sun never sets. Here's where, for how long, and what it's like to experience the midnight sun.

Around June 21 each year, the Northern Hemisphere has its longest day. Here's the astronomy of the solstice and how it varies by latitude.

Twilight has three formal stages — civil, nautical, and astronomical. Here's what defines each one and what you can actually see in them.

Moon sighting determines when Islamic months start. The science of when the new moon becomes visible is surprisingly complex.