1. The Tilt: The Earth's axis is tilted at approximately 23.5 degrees. This tilt is the reason we have seasons.
2. The Circle: As the Earth orbits the Sun, the tilted axis causes the Sun to appear to move higher in the sky during summer and lower in the sky during winter in each hemisphere. This apparent movement creates a circular path – the ecliptic.
3. The Path:
- Summer Solstice (around June 21st in the Northern Hemisphere): The Sun appears highest in the sky in the Northern Hemisphere, and its apparent path across the sky is at its most northerly point.
- Winter Solstice (around December 21st in the Northern Hemisphere): The Sun appears lowest in the sky in the Northern Hemisphere, and its apparent path is at its most southerly point.
- Equinoxes (around March 20th and September 22nd): The Sun appears directly overhead at the equator, and the day and night are approximately equal in length.
4. Zodiac: The ecliptic passes through twelve constellations, which are traditionally known as the zodiac. The Sun appears to move through these constellations throughout the year.
5. Not a Perfect Circle: The ecliptic is not a perfect circle because the Earth's orbit is slightly elliptical. However, the difference is subtle and can be approximated as a circle for general understanding.
Important Note: The apparent path of the Sun as described above is from the perspective of an observer on Earth. In reality, the Sun is stationary, and the Earth revolves around it.
