Introductory Astronomy Complete University Course - Solar Eclipses: What Are They and Why Do They Happen?

This video is part of a comprehensive series initially developed for William Paterson University and CUNY Hunter, aimed at supporting online classes and course materials for introductory astronomy. By engaging with all the videos within this series, you will effectively complete a full undergraduate course in astronomy, equipping yourself with the knowledge and skills necessary to navigate the night sky with confidence, learning all the basics and many advanced topics! In this session, I explain total solar eclipses, where the Moon covers the Sun entirely. Solar eclipses can be partial, annular, or total. Annular eclipses create a ring-like appearance when the Moon is too far away to cover the Sun completely. Eclipses don’t happen every month because the Moon’s orbital plane is tilted by about 5.2 degrees relative to Earth’s orbit around the Sun. This tilt prevents the Moon’s shadow from always aligning with Earth during a new moon, resulting in specific periods, called eclipse seasons, when eclipses are possible. A total solar eclipse occurs when the Sun, Moon, and Earth align perfectly. The Moon must be at a node (the intersection of its orbit and the ecliptic) during a new moon for this alignment to happen. During a total solar eclipse, the dark central region (umbra) of the Moon’s shadow creates a total eclipse visible in a small area on Earth, while the surrounding penumbra causes a partial eclipse. An annular eclipse occurs when the Moon is too far from Earth to cover the Sun completely, forming a ring. I review upcoming solar eclipses including the recent April 8, 2024, with more throughout the next decades. Different global regions will experience these events, offering unique viewing opportunities. It’s important to observe solar eclipses safely using eclipse glasses, solar filters, or pinhole projectors to protect your eyes from the Sun’s intense light. Experiencing a total solar eclipse reveals the Sun’s corona, creating a breathtaking sight. This event emphasizes the precise alignment and size similarity of the Sun and Moon from our perspective on Earth. #TotalSolarEclipse #SolarEclipse #AnnularEclipse #PartialEclipse #EclipseSeasons #Astronomy #MoonShadow #EclipseSafety #EclipseGlasses #SolarFilters #SunCorona #Astrophysics #UpcomingEclipses #EclipseViewing #SpaceEducation