June 20 or 21st known as the summer_______.

• A. Equinox
• B. Tilt
• C. Eclipse
• D. Solstice

Answer: (D)

The main idea is the solstice, a seasonal marker tied to how Earth is tilted. On the summer solstice the Sun reaches its highest point in the sky at local noon, and the day is the longest of the year in the Northern Hemisphere. This happens because Earth’s axis is tilted about 23.5 degrees relative to its orbit around the Sun, so around this time the Northern Hemisphere is tilted closest toward the Sun. The exact date can land on June 20 or 21 depending on the year and your time zone, since the solar year doesn’t line up perfectly with our calendar and leap-year adjustments shift the observed date. This is different from an equinox, when day and night are about equal and the Sun is over the celestial equator, and it’s not an eclipse, which is an alignment event involving the Sun, Moon, and Earth.