The Solar Astronomical Year Is The Period Of Time In Which The Earth Performs A Revolution In Its Orbit About The Sun, Or Passes From Any Point Of The Ecliptic To The Same Point Again; And Consists Of 365 Days 5 Hours 48 Min.
Each solstice is upon the ecliptic midway between the equinoxes, and therefore go from each.
Since the sun moves in the ecliptic, it is in the last-named sense the point of intersection of the ecliptic and the celestial equator.
The plane of the ecliptic is that plane in or near which the centre of gravity of the earth and moon.
The ecliptic itself is the great circle in which this plane meets the celestial sphere.