2024年1月13日 Circling the Sun Image Credit & Copyright: Radoslav Zboran Explanation: Earth’s orbit around the Sun is not a circle, it’s an ellipse. The point along its elliptical orbit where our fair planet is closest to the Sun is called perihelion. This year, perihelion was on Januar […]
2023年10月14日 Circular Sun Halo Image Credit & Copyright: Vincenzo Mirabella Explanation: Want to see a ring around the Sun? It’s easy to do in daytime skies around the world. Created by randomly oriented ice crystals in thin high cirrus clouds, circular 22 degree halos are visible much mor
2023年5月25日 Cat’s Eye Wide and Deep Image Credit & Copyright: Jean-François Bax, Guillaume Gruntz Explanation: The Cat’s Eye Nebula (NGC 6543) is one of the best known planetary nebulae in the sky. Its more familiar outlines are seen in the brighter central region of the nebula in th
