Why does the sun up in the summer and not in the winter?

The sun appears higher in the sky during summer and lower during winter due to the tilt of the Earth's axis. In summer, the Northern Hemisphere is tilted toward the sun, resulting in longer days and more direct sunlight. Conversely, in winter, the hemisphere is tilted away from the sun, leading to shorter days and less direct sunlight. This axial tilt creates the seasonal variations in sunlight that we experience throughout the year.