Ecliptic, Celestial equator and horizon?

  • Thread starter atomqwerty
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  • #1
atomqwerty
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Hi, I think I have I little misunderstood about these three concepts:
Ecliptic
Celestial equator
Horizon


Can someone explain me the difference between them, specially between the second and the third ones?

Thank you

carlos
 

Answers and Replies

  • #2
Janus
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The ecliptic is the plane of the Earth's orbit. From the Earth, it would be the path the Sun follows against the background of the stars during the year.

The celestial equator is simply the Earth's equator projected onto the background of the sky.

The horizon is the dividing line between Earth and sky.
 
  • #3
Judas503
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Ecliptic is the path the Sun follows as seen on the sky which is tilted to the equator by about 23.5 degrees.

Celestial equator is the projection of the Earth's equator on the celestial sphere.

Horizon can be considered as a plane tangential to the position of the observer. This is also at an angle with the celestial equator which is equal to the axial tilt.
 
  • #4
atomqwerty
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thank you all
now the biggest doubt I have is the precession of the equinoxes, i mean... where is the Aries point (vernal equinox) right now? and next year? and within 100 years?
 

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