Questions in this quiz: Eclipses — Solar and Lunar

Eclipse types (total, partial, annular, hybrid), the Saros cycle, totality paths, lunar eclipses (umbra/penumbra), historical eclipses, and famous total solar eclipses of the past 50 years.

1. The Saros cycle, which predicts the recurrence of similar eclipses, has a period of approximately how long? — Options: 11 years, 4 months, 18 years, 11 days, 8 hours, 33 years, 7 days, 7 years, 6 months
2. What geometric condition produces an annular solar eclipse rather than a total one? — Options: The Moon is near apogee, so its angular diameter is smaller than the Sun's, The Moon is near perigee, so its angular diameter exceeds the Sun's, The Earth is at aphelion, increasing the Sun's apparent size, The Moon crosses the ecliptic at a steep angle near a node
3. A hybrid solar eclipse is best described as one that: — Options: Combines a solar and lunar eclipse within the same lunation, Appears annular at the start and end of its path but total in the middle, Shows totality in one hemisphere and partiality in the other simultaneously, Transitions from a partial to a total eclipse as it crosses the terminator
4. During a total lunar eclipse, the Moon often appears reddish because: — Options: Iron oxides on the lunar surface fluoresce in cosmic radiation, Sunlight is refracted through Earth's atmosphere, filtering out shorter wavelengths, The Moon emits residual infrared heat from before entering the umbra, Solar wind ionizes lunar regolith, producing a red glow
5. The total solar eclipse of 21 August 2017, widely watched across the United States, was popularly nicknamed: — Options: The Heartland Eclipse, The Great American Eclipse, The Coast-to-Coast Shadow, The Eclipse of the Plains
6. A total solar eclipse in 1919 became historically significant because observations during it: — Options: Confirmed the existence of helium in the solar atmosphere, Provided the first measurements of the solar corona's temperature, Verified Einstein's prediction of light bending by gravity, Detected the first evidence of solar neutrinos
7. Within the geometry of a lunar eclipse, the penumbra is best defined as the region where: — Options: The Earth's shadow is completely blocking the Sun from the Moon's surface, Only part of the Sun's disk is occluded by the Earth as seen from the Moon, The Moon's atmosphere refracts incoming sunlight into a halo, The Sun's outer corona becomes visible due to atmospheric scattering