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Celestial Motions

Celestial Motions - Celestial Motions Ancient Observatories...

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Celestial Motions Ancient Observatories of Great Important to Cultures o Here is an observatory built by an ancient Native American culture in Central America. Many great civilizations built observatories such as this. These structures demonstrate how important ancient astronomers were to cultures all over the world. They were the timekeepers! o Naked- eye astronomy – requires no equipment but human vision o All cultures have some kind of observers in the past. Constellations – Latin word means group of stars o There are only 6000 stars that can be observed with the naked eye from Earth. o There are only 88 constellations in the sky. – in box - Originally, these constellations were directly related to mythological creatures. Today, constellations are well defined regions of the sky. All stars that lie within a constellation’s region are a part of that constellation. – most stars in a constellation are nowhere near one another. (only appear to be close together because they are in nearly the same direction as seen from Earth o O’Ryan – great hunter o Woman – upside down – punished o The appearance of the sky changes during the course of the night and from one night to the next Celestial Sphere o Recall that the Earth has a coordinate system; longitude and latitude. Extend this grid from the Earth’s surface into space. Now you have the Celestial Sphere. o Declination tells you how far north or south of the equator in degrees. o Right Ascention tell you how far east or west of the Vernal Equinox in hours, minutes and seconds. o Reality OR Celestial – cannot mix the 2 models o Earth in ball – earth not moving – ball rotates Prime – Long.
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North – positive , South - negative Celestial Sphere’s Equator is an extension of Earth’s Equator o Divides the sky into northern and southern hemispheres o Pretend the Earth is fixed and surrounded by a sphere. On this Celestial Sphere the stars and planets.
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Celestial Motions - Celestial Motions Ancient Observatories...

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