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Moon pairings in April 2021

Sky Tour Astronomy Podcast

April: Follow the Moon

To learn “what’s up” at night during April, download Sky Tour — an engaging narrated guide to the planets, stars, and constellations now visible.

Europa eclipses then occults Io

Celestial News & Events

Mutual Event Season Heats Up at Jupiter

Jupiter is usually the one occulting and eclipsing the Galilean moons, but this observing season the moons also eclipse and occult one another.

3D-printed version of Cassiopeia A supernova remnant

Stargazer's Corner: Adventures Under the Night Sky

Believing Isn't Seeing: Teaching Astronomy for the Visually Impaired

Teaching the night sky to the blind and low-vision community opens up new ways of experiencing the cosmos.

Saturn and Jupiter at dawn, early April 2021

Celestial News & Events

This Week's Sky at a Glance, March 26 – April 3

Fading Mars glows above orange Aldebaran high in the west after dark. Orion tilts into his spring posture, with his belt horizontal. Arcturus climbs up in the east.

Deep image of V1405 Cas nova

Stellar Science

Bright Nova Erupts in Cassiopeia

A new nova in Cassiopeia, discovered on March 18th, is bright enough to see in a small telescope.

Moon and Regulus, March 24-25, 2021

Celestial News & Events

This Week's Sky at a Glance, March 19 – 27

The waxing Moon shines with Mars and Aldebaran on Friday evening the 19th. From there the Moon marches east day by day – first between the horn stars of Taurus, then across Gemini to sidle up to Castor and Pollux on the 22nd.

NGC 3190 group / Hickson 44

Deep Sky

Exploring Bright Galaxy Groups in Leo

Leo, the Lion, stands high in the southern sky during the early spring. We visit some of the constellation's brighter galaxy clumps then go asteroid hunting.

Moon passing Mars and Aldebaran, March 18-19, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, March 12 – 20

The waxing Moon passes between Mars and Aldebaran in the evening sky. Arcturus, the "Spring Star," climbs up in the east, while wintry Orion tilts down in the southwest.

Alnilam in Orion

Night Sky Sights

Meet Alnilam, Orion’s Belt Buckle

Alnilam, the middle star of Orion's distinctive belt, is a distant supergiant that will (eventually) end its life in a supernova.

Jupiter, Saturn, Mercury, with Moon, March 9-10, 2021

This Week's Sky At a Glance

This Week's Sky At a Glance, March 5 – 13

Sirius shines high on the meridian right after dark, as Orion starts tilting westward. Mars keeps company with the Pleiades. And three planets help you greet the dawn.

Battered Vesta

Night Sky Sights

March — A Good Time to Visit Vesta

Dip into this easy guide to seeing the brightest asteroid, Vesta, and understanding what makes it unique.

Stars of the Winter Hexagon

Sky Tour Astronomy Podcast

March: Find the Winter Hexagon

Our Sky Tour astronomy podcast provides an engaging guided tour of the planets, stars, and constellations overhead during March.

Mars with Aldebaran and Pleiades, March 4, 2021

Celestial News & Events

This Week's Sky at a Glance, February 26 – March 6

Mars is passing the Pleiades. Sirius and Canis Major take over the early-evening meridian from Orion. And low in the dawn, Jupiter closes in on Mercury.

This Week's Sky At a Glance

This Week's Sky at a Glance, February 19 – 27

Sirius the Dog Star blazes high in the southeast after dinnertime, the brightest star of Canis Major. Spot it lower left of Orion. The stars of Canis Major can be connected to form a convincing dog profile.

Winter Hexagon (February)

Night Sky Sights

Watch the Moon Journey Across the Winter Hexagon

About once a month this winter, we can watch the Moon take a four-day journey across a field of stars termed the "Winter Hexagon."

IC 418 planetary nebula

Night Sky Sights

A Deep-sky Hippity-hop through Lepus, the Hare

Snare a dozen bright double stars and deep-sky objects in the celestial Hare the next clear night. We also provide details on how to watch the potentially hazardous asteroid Apophis occult a star the night of February 21st.

Moon passing Mars and Aldebaran, Feb. 18-20, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, February 12 – 20

The Moon, waxing through first quarter, passes Mars and Aldebaran high in the evening sky.

Moon and Antares at dawn, Feb 5-7, 2021

Celestial News & Events

This Week's Sky at a Glance, February 5 – 13

The sky's biggest asterism — at least the biggest one widely recognized — is the Winter Hexagon. It fills the sky toward the east and south these evenings. Start with brilliant Sirius at its bottom. . .

Daytime planet fest

Celestial News & Events

Planets and Comets Can't Hide from SOHO's Eye

With the help of the Solar Heliospheric Observatory you can not only keep track of the planets in the daytime sky but maybe even discover a comet.

Star chart for Monoceros

Sky Tour Astronomy Podcast

February: The Hare & Unicorn

When you step outside to admire the crisp, starlit night sky on February evenings, bring along our Sky Tour astronomy podcast to learn which stars and constellations are overhead. Here’s a preview of what you'll see.