9 terms

S.O. Celestial Sphere and its Points

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celestial sphere
Imaginary globe where Earth is at the centre and provides an easy way of describing position of objects in sky.
diurnal motion
Apparent daily motion of the stars, caused by earth's rotation.
zenith
The point in the sky directly above the observer.
horizon
The apparent meeting of the sky and Earth. Marks the limit of a person's vision.
four directions
North, South, East and West are marked of the celestial sphere.
celestial meridian
The imaginary line through the observer's zenith. This line divides the sky into two parts.
north celestial pole
The point at which the sky seems to rotate around. Polaris is the star closest to the north celestial pole. Polaris is above the north pole of Earth.
ecliptic
Apparent path the sun takes across the sky, but you know it is the Earth that is moving around the sun.
celestial equator
The Earth's equator projected out into space. This separates the sky (celestial sphere) into a northern & southern hemisphere.