Celebrate the Night Sky During April

Amateur skygazers can satisfy their celestial cravings with Globe at Night, International Dark-Sky Week, Astronomy Day, and Global Astronomy Month.

Solar viewing at NEAF

Solar observing has become a regular fare at many Astronomy Day activities worldwide. Here attendees at the Northeast Astronomy Forum & Telescope Show enjoy views of the Sun in hydrogen-alpha light.

Here in Boston, we've had a long, miserable winter. (I still have piles of snow in my yard!) But the days are getting warmer, Leo and other constellations of spring are up there for the viewing, and I am totally ready to start enjoying the night sky at full throttle again. The timing couldn't be better, because April, especially, provides many avenues for revitalizing one's interest in stargazing. In fact, no other month offers so many organized activities for amateur astronomers.

Coming up fast is Astronomy Day, which this year falls on April 25th. One of the most important and enduring annual stargazing events, Astronomy Day got its start in 1973. It's a high-profile way to draw public attention to the science and the hobby of astronomy through exhibits and activities at urban centers. Astronomy clubs, observatories, museums, colleges, and planetariums worldwide now host special family-oriented Astronomy Day events and festivities. Some organizations extend their activities over an entire week. Check out the Astronomical League's Astro-Day page for details.

Globe at Night logo

Globe at Night uses simple methods to estimate the amount of light pollution in your night sky.
Globe at Night

One quick and easy activity is Globe at Night, a worldwide star-counting exercise that you can do alone or with your family and friends. I'm a big fan of this program, now in its 10th year.

Here's how it works. First, you'll need a clear night with minimal interference from moonlight. Next, go outside at least an hour after sunset — say, 8:30 p.m. or later here in the U.S. — and estimate the limiting magnitude of your night sky. The sky charts from Globe at Night make it easy to determine the darkness of your night sky, and they're available in 28 different languages! Then jump online to report your observation — or just use the handy web app. You'll need to know your latitude and longitude, but the website has a mapping tool to help you figure that out. Go for it!

Young stargazer
A budding stargazer takes a peek during a locally organized star party in Chelmsford, Massachusetts.
J. Kelly Beatty

April 13th to 19th is International Dark Sky Week. Also designed to draw attention to light pollution, IDSW was conceived in 2002 by high-school student Jennifer Barlow. She's all grown up now, but her core message is the same: reducing light pollution is a win-win situation that saves energy, reduces greenhouse gases, protects the environment, and improves human health. You can participate in simple ways: check around your home to ensure that outdoor lighting is fully shielded, or at least angled downward; talk to your neighbors about the value of dark skies; attend (or host!) a neighborhood star party! These ideas and more are detailed on the International Dark-Sky Association's IDSW web page.

April is Global Astronomy Month

April is Global Astronomy Month.
Astronomers Without Borders

Finally, even if you can't find a local venue to whoop it up, you can join the worldwide celebration of the night sky thanks to Global Astronomy Month. Spearheaded by the "One People, One Sky" folks at Astronomers Without Borders, GAM is the world's largest global celebration of astronomy. It embraces all kinds of activities in many different venues: Sun Day, astro-poetry, an astrophoto contest, Jupiter and Saturn "watches", and much more. There are even online-only events like "Walking on the Moon" and the "Cosmic Concert." Check out GAM's program schedule for details.

With so many activities on tap, something here will surely be interesting — even you're just a casual skygazer.


Just getting started in amateur astronomy? It's easy to navigate the night sky with one of Sky & Telescope's exclusive star wheels (planispheres).