• Sunset Icon SUNSET:
  • Full Moon Icon MOON: 90% Waxing Gibbous
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Where to Look Tonight


This Week's Sky at a Glance, September 17 – 25

This Week's Sky at a Glance, September 17 – 25

The waxing gibbous Moon shines with Jupiter and Saturn on its way to full. And as summer turns to fall, Deneb replaces Vega as the zenith star after dusk.

where to look

Summer Triangle Overhead

Sky Tour Podcast

The calendar might say “September,” but now is the perfect time to explore the Summer Triangle. Find your way with this month’s Sky Tour podcast.

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What are the Phases of the Moon?

What are the Phases of the Moon?

The phases of the Moon are determined by the relative positions of the Moon, Earth, and Sun.

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The cover of the November 2021 issue

This Month’s Issue

Sky & Telescope Magazine

Explore the astronomy magazine that’s been out of this world for over 75 years.

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The cover of the November 2021 issue

Issue Highlights

  • A Golden Age for Amateur Astronomy

    William Sheehan and Klaus Brasch

  • Building the James Webb Space Telescope

    Paul H. Geithner

  • To Build or Buy?

    Jerry Oltion