2026, March 18-21: Crescent Moon and Earthshine Visible in the Evening

March 18-21, 2026: A thin crescent moon appears low in the western sky after sunset, revealing earthshine — the softly lit “Old Moon in the New Moon’s Arms.”

2026, February 9: Winter Stars Explained: Orion, Sirius, and the Hertzsprung–Russell Diagram

February 9, 2026: Explore winter’s brightest stars with a binocular. Learn how Orion, Sirius, and Betelgeuse reveal stellar temperature, color, and brightness through the Hertzsprung–Russell diagram.