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A labeled close-up of the Moon's surface showing the craters Galilaei and Galilaei A near the crater Reiner, separated by the bright streak-like feature Reiner Gamma, with a compass indicating north and east and an inset showing the location on the full lunar disk.

The Sky Today on Wednesday, September 23: Around Reiner Gamma

Hubble image of variable star RS Puppis

How to become a variable star observer

A photograph of an autumn sunrise showing the Sun as a bright golden-orange disc rising just behind the dark silhouette of a leafy tree, with streaks of orange-lit clouds spread across a deep red-orange sky. Additional silhouetted trees and shrubs line the dark foreground.

The Sky Today on Tuesday, September 22: The autumnal equinox

A telescopic simulation of Saturn and four of its moons on September 21, 2026, at midnight CDT, shown against a black background. Saturn is displayed in the lower right with its rings tilted at a shallow angle. Titan appears as a bright white point to the upper left of the planet, while Tethys, Dione, and Rhea are visible as smaller faint points arranged diagonally to the left of Saturn, with Rhea the farthest out. North and east compass directions are shown in the upper left, and a scale bar indicates 36 arcseconds.

The Sky Today on Monday, September 21: Saturn passes a field star

Path of asteroid Juno in September 2026

The Sky Today on Sunday, September 20: Juno’s movement

A sky chart showing the eastern sky on September 19, 2026, one hour before sunrise. Mars glows orange just to the right of Pollux in the upper center, with Castor labeled just above Pollux. Jupiter shines brightly in the lower center, Procyon is visible to the right, and Sirius glows blue-white in the upper far right. Betelgeuse glows orange in the upper right corner. The sky fades from deep blue-black above to a subtle twilight glow near the dark treeline silhouette along the bottom.

The Sky Today on Saturday, September 19: Mars meets Pollux

A telescopic photograph of NGC 7243, a loose open star cluster set against a densely packed star field. The cluster's members are scattered loosely near the center of the image, with a mix of bright blue-white stars standing out against a background of countless fainter yellow-white and gold stars on a black sky.

The Sky Today on Friday, September 18: The Lizard’s brightest cluster

A photograph of the autumnal equinox sunrise over a hazy rural landscape in Spain, showing the Sun as a large, heavily distorted red-orange disc flattened by atmospheric refraction just above the treeline. A silhouetted tree line, distant mountains, and what appears to be a castle or fortress on a hilltop are visible through the haze. Pink-tinted clouds and a gray-blue sky fill the upper portion of the frame, and a flat golden field stretches across the foreground.

Sky This Week, The Sky This Week

The Sky This Week from September 18 to 25: Autumn begins

A sky chart showing the southern sky on September 17, 2026, one hour after sunset. The crescent Moon glows brightly near the upper center, with Antares labeled as a reddish-orange point just to its right. The sky transitions from deep brown-black above to a warm amber-brown twilight glow near the dark horizon silhouette.

The Sky Today on Thursday, September 17: The Moon and the Scorpion

Star chart showing the constellation Triangulum

The Sky Today on Wednesday, September 16: Triangle in the sky

The Sky Today on Tuesday, September 15: View the false dawn

A Stellarium sky chart showing the western sky on September 14, 2026, at 7:30 P.M. UTC-05:00. The crescent Moon is labeled in the upper left, Venus shines brightly just below and to its right, and Mercury is visible as a faint point low near the horizon in the lower right. The sky is dominated by a warm orange twilight glow fading to brown near the dark horizon silhouette.

The Sky Today on Monday, September 14: Connect four