Final answer:
The Sun disappears at night due to Earth's rotation which causes diurnal motion, the tilt of Earth's axis that leads to varying daylight hours across seasons, and the movement of the Sun in the celestial sphere as Earth orbits around it.
Step-by-step explanation:
The phenomenon of the Sun disappearing at night can be attributed to Earth's rotation. Here are three pieces of evidence and reasons for this occurrence:
Diurnal motion: Due to Earth's rotation on its axis, we experience day and night. The side of the Earth facing the Sun experiences daylight, while the other side experiences night. As Earth rotates, different parts of the surface transition from day to night, leading to the Sun 'disappearing' from our view.Varying hours of daylight: The duration of daylight changes with seasons because Earth's axis is tilted. During summer, the pole pointing towards the Sun has longer days, and during winter, shorter days. This affects how long the Sun stays above the horizon.Celestial sphere: The apparent path of the Sun across the sky called the ecliptic, varies throughout the year. The Sun's position relative to the horizon changes, contributing to the varying length of day and night across seasons.
Understanding these concepts helps explain the Sun's daily movement and the transition from day to night, providing a basic understanding of Earth's rotation and its impact on the night sky.