From April 4 to 12, the night sky offers several notable celestial events. The first-quarter Moon will be visible near Mars, Pollux, and Castor, forming a triangle on April 4 and 5. The Big Dipper will be high in the northeast, while the Moon will pass through Leo with Regulus and Gamma Leonis. The Winter Hexagon, with stars like Sirius and Capella, remains visible early in the evening. Late evenings will see Arcturus and Sirius at similar heights and Mars aligning with Pollux and Castor by April 10. The full Moon will occur on April 12, close to Spica. https://skyandtelescope.org/astronomy-news/this-weeks-sky-at-a-glance-april-4-12/