The celestial sphere, the coordinates system, seasons ...
The celestial sphere, the coordinates system, seasons, phases of the moon and eclipses
Chapters 2 and S1
The celestial sphere and the coordinates system
Chapter S1
How to find our way in the sky? Let's start with the Earth Coordinate System
Latitude: N-S of the equator, Longitude: E-W along equator
From Earth to Space
The Celestial Sphere
? The Celestial Sphere: An
imaginary sphere of infinite
radius centered on Earth. ? The extensions of the Earth
North Celestial Pole
North and South Pole define
the North and South celestial
poles.
? The projection of Earth equator defines the Celestial equator.
? Celestial Sphere can then be divided into a grid, just like the Earth is divided into a grid of latitude and longitude.
North celestial poleNorth
Celestial Equato r
South Celestial Pole
The Celestial Sphere: Motions
? Stars, planets and Sun are "attached" to this imaginary sphere.
? As the Earth rotates, the celestial sphere (with the stars attached to it) appears to rotate in the opposite direction.
? To explain the daily motions of the sky you can imagine the sphere rotating once in 23 hours 56 minutes (using a star as reference).
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