The 3 Shadow Zones
Umbra: The inner dark cone where the Sun is completely blocked. Standing here yields a Total Eclipse. Penumbra: The outer cone of partial blockage. Antumbra: Where the Moon is too small to cover the Sun, leaving the "Ring of Fire".
Why Not Every New Moon?
The Moon's orbit is tilted by 5.14° relative to Earth's ecliptic plane. Most months, the Moon passes above or below the Sun. Eclipses occur only when New or Full Moon coincides with the orbital crossing points (Nodes).
The Blood Moon Mechanics
During a Total Lunar Eclipse, Earth blocks direct sunlight. However, Earth's atmosphere acts like a lens: Rayleigh scattering filters out blue wavelengths and bends red sunset rays directly into the Umbral shadow.