Astronomical Ceilings

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grade 9 science

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Natural Sciences General Knowledge

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Star Constellations:

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The Planets

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Astronomical Ceilings

The Foreleg is the only one that exists in the modern sky and is called the Plough or Big Dipper

However, its possition has changed

The stars are divided into 2 groups

Stars in the north who don't rise or set (circumpolar group)

Stars in the south who rise and set (decans)

The representation of circupolar group & number of figures change

However, 3 characters don't change (the foreleg, hippopotamus & the mooring post)

The circumpolar group is situated in the northern half of the ceiling

They don't rise or set but rotate around the north celestial pole

Circumpolar group is a group of stars or constelation with particular behavior when observed from Egypt

Planets & decans occupy the southern part of the ceiling

The decans are interpersed with two groups of planets

3 plantes have orbits outside the earth

Between the ordinary and triangle dicans (Mars, Jupiter & Saturn)

2 planets whose orbit is inside that of the earth, the morning & evening stars

Follow the triangle decans (Mercury and Vinus)

The calendar is not present in the ceilings but the stars and their order are

The diagonal star tables record stars performing a particular action in order throughout the year

The 1st major element is a list of stars known as decans

The number of decans change but their order doesn't change

they are divided into 2 groups named Ordinary & triangle decans

11 or 12 triangle decans

there are 36 ordinary decans

How they decorated the ceilings

By the new kingdom, they used more representative designs

In the earlier times, they painted the ceiling blue and painted yellow five pointed stars

The ancient Egyptians tryed to keep the design of the ceilings as close as possible to the sky