astronomy

Astronomy
study of celestial bodies or objects such as ;star,planet,comets,and galaxies and its phenomena.
greek world''astron-star,''nomos-law''
During the 20th century,astronomy split into 2 major categories;physics and technology.
a.observational astronomy
focused in acquiring data from observation which analized by the aids of basics principles of physics.
b.Theoritical astronomy
oriented toward the development computer or analitical models to descrides astronomical objects and phenomena.
Some contribution of early civilization;
Babylonian-beginning of mathematical and scientific astronomy, they discovered the lunar eclipse recorded in repeating cycleknoun as ''saros''
Greek
Aristarcus-calculated the mass of the earth and meassure the distance of the moonand star,he also the 1st to proposed the hellcentric model of the solar system.
Hipparcus -invented the 1st and earliest known astronomical device such as''astrolabe''
Persian
Azophi-discover the andromeda galaxies and describe in the book of'' fixed of stars''.
Egyptians
Ali Ibn Ridwan-discovered the'' supernova''.
SOLAR SYSTEM INDIVIDUAL
1.inner planets -consist of mercury,venus earth and mars
2.asteriods pelts-composed of asteroids
3.outer planets-consist of giant gas planets, jupiter,uranus and neptune
STELLAR ASTRONOMY-study of star and its formation
EXTA GALACTIC ASTRONOMY-study the of object outside the galaxy
GALMETRIC-study of galaxies
Organization and distribution of galaxy
1.Eliptical Galaxy -cross sectional
2.Spiral Galaxy-flat rotating dish
3.Irregular galaxy-chaotic apperance