Every 24 hours the Earth turns once on its axis, carrying us from morning light into the dark of night; every year it travels once around the Sun, and its gentle tilt paints the seasons across our sky.
The spinning Earth
The Earth rotates once about every 24 hours around an imaginary line called its axis. The side facing the Sun has daytime; the side turned away has night. The Sun does not really move across the sky — it is we who are turning eastward, which is why the Sun appears to rise in the east and set in the west.
A tilted world and the seasons
Earth's axis is tilted by about 23.5°. As Earth orbits the Sun once a year, this tilt means different parts receive more direct sunlight at different times.
- In summer, your hemisphere leans towards the Sun: longer days, higher Sun, more warmth.
- In winter, your hemisphere leans away: shorter days, lower Sun, less warmth.
- The tilt, not the distance to the Sun, causes the seasons.
The year as one orbit
One full orbit of the Sun takes about 365.25 days, which is why we add a leap day every four years. The Northern and Southern Hemispheres always have opposite seasons.
🌙 In the Qur'an & Sunnah
The measured motion of Sun, Moon, day and night is described in the Qur'an as a sign to reflect upon:
"And it is He who created the night and the day and the sun and the moon; each in an orbit (falak) swimming." (Qur'an 21:33)and
"It is not for the sun to overtake the moon, nor does the night outstrip the day; each, in an orbit, is swimming." (Qur'an 36:40)Another verse speaks of the night and day being wrapped over one another:
"...He wraps (yukawwir) the night over the day and wraps the day over the night..." (Qur'an 39:5)The Arabic yukawwir means to coil or wrap something around a ball; many Muslims find it fits naturally with a round, turning Earth, though this is offered as a reflection, not a proof. As the Qur'an says,
"Indeed, in the creation of the heavens and the earth and the alternation of the night and the day are signs for those of understanding." (Qur'an 3:190)
Two different motions, two different effects
Mixing these up is the classic error: one motion gives us day and night, the other gives us the year and the seasons.
| Motion | How long it takes | What it causes |
|---|---|---|
| Rotation on its axis | About 24 hours | Day and night |
| Orbit around the Sun | About one year | The year itself |
| Axial tilt of about 23.5 degrees | Constant | The seasons |
And the Sun does not really cross the sky — we turn eastward, which is why it appears to rise in the east and set in the west.
Which motion explains each one?
- Day turning into night
- The Sun appearing to rise in the east
- A 24-hour cycle
- Summer and winter
- Longer days in summer
- A year-long cycle