CELESTIAL GUIDEBOOK HOUR 1

MAPPING THE STARS

• Ancient cultures organized stars by linking stars together.
• Different civilization gave names to the stars to indicate the position.
• Modern astronomers still use the names today.
• Astronomers can now describe the star precisely by understanding the names and the position.

CONSTELLATION

• The stars are linked in a section of a pattern.
• Constellqtions are the sections of the sky that remains recognizable stars pattern.
• The cultures organized these patterns to honor their gods.
• Constellations also track the motions of the planets and stars.
• Different cultures has different names for the same constellations.

REGIONS OF THE NIGHT SKY

• A constellation is a entire region of the sky
• Each of the constellations have a border to eachother
• Astronomers divided the sky into 88 constellations
• They use the same names for each of the constellations

SEASONAL CHANGES

• Constellations can change from season to season while earth orbits the sun
• People in ancient times kept track of the right time to plant and harvest crops.
• The northern hemisphere is the spring and the others are summer,fall,and winter.

FINDIND STARS IN THE NIGHT SKY

• In astronomy, altitude the angle between an object and the horizon.
• Zenith is an imaginary point and is always 90% angle at the sky.
• Horizon, the point where the sky and Earth meet.
• With them combined you can find the planet or stars location.

DESCRIBING A STAR'S POSITION

• Astronomer use a system called celestial sphere to locate its position.
• Right ascension is measured of how east an object is from the sun.
• Declination is how far north from the celestial equator.
• The point on right ascension is called vernal equinox.

THE SIZE AND SCALE OF THE UNIVERSE

• Copernicus notice stars don't shifted their position.
• If stars were near he thought they shift like planet's positions.
• He thought the stars must be far away from the planets.

MOON

• Satellites are artificial bodies that revolve around the planets.
• On the lunar moon the apollo astronauts brought back the rocks and it appered to be 4.6 billion years old.
• With the rocks astronomers can now calculate the age of the moon.
• With the craters they can also calculate the age.

PHASES OF THE MOON

• The moon changes and within a month the faces change.
• The changes is changing its position from the earth and sun.
• As it revolve around the earth the sun's sunlight hits it less or more by where the moon is.
• The changing positions are called phases.
• Full moon,

GLOSSARY

• Constellastion-A section of the sky that contains a recognizable star pattern.
• Right ascension-A measure of how Far East an object is from the point at which the sun appera on the first day of spring.
• Declination-A measure of how far north or south an object is from the celestial equator.
• Light year-A unit of length equal to the distance that light travels through space 1 year.
• Satellites-A natural or artificial body that revolves around a planet. Phases-The different appearances of the moon due to varying amounts of sunlight on the side of the moon that faces the earth.