Astronomy – The study of the motions and properties of objects in space.

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Presentation transcript:

L.O: Students will be able to describe the motion of celestial objects.

Astronomy – The study of the motions and properties of objects in space. Celestial object – an object in the sky outside Earth’s atmosphere Ex) the Sun, moon, stars and planets. Terrestrial means “of the Earth” Terrestrial objects are all Earthly objects

Earth (oblate spheroid) rotates 15o/hr West to East. (We move WE) Look at the board, slowly turn to the right, which way does the board appear to move? Therefore, celestial objects appear to move in an arc at 15o/hr rising in the East and setting in the West.

Because we rotate around our axis and our axis points to Polaris, the other stars appear to move around Polaris, creating a star trail. The stars do not actually move! celestial objects appear to move 15o per hour.

**At the Northpole CELESTIAL OBJECTS APPEAR TO ROTATE 150 per hour around POLARIS (the north star)

If all celestial objects appear to move at 150 per hour, how many hours has the Earth moved when this picture was taken? four hours!

EACH TIME ZONE IS 150 WIDE

Ancient people looked up at the sky and saw patterns. They “connected the STARS” & saw: gods, animals, heroes & heroines from their Myths.

Constellations: are groups of stars that make an identifiable pattern.

Astronomers use the constellations to help locate particular stars Astronomers use the constellations to help locate particular stars. we use the “pointer stars” on the Big dipper to find Polaris on the Little Dipper

Viewed from the North Pole, all stars & constellations appear to rotate around Polaris. Polaris, here in the center

*SOLAR NOON: WHEN THE SUN IS HIGHEST IN THE SKY

*A person’s shadow is shortest at solar noon.

***At solar noon a shadow caused by the SUN points due North.

Solar noon’s altitudes are different at different times of the year Solar noon’s altitudes are different at different times of the year. Highest on June 21st. Lowest altitude on Dec 21st

This is solar noon in New York state.

EARTH HAS NIGHT AND DAY BECAUSE IT ROTATES ON ITS AXIS.

THE SIDE FACING THE SUN IS “DAY”. THE SIDE AWAY FROM THE SUN IS “NIGHT”

EARTH TAKES 24 HOURS TO ROTATE

EARTH MOVE 15 0 DEGREES EVERY HOUR. 150 X 24= 3600 DEGREES

For every hour, the Sun appears to move 15 0 degrees per hour!