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SMALLESTLARGEST UNIVERSE TIME SPACE EVERYTHING SOLAR SYSTEM STARSGALAXIES MILKY WAY PLANETS OTHER CRAP SUN NORTH STAR.

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Presentation on theme: "SMALLESTLARGEST UNIVERSE TIME SPACE EVERYTHING SOLAR SYSTEM STARSGALAXIES MILKY WAY PLANETS OTHER CRAP SUN NORTH STAR."— Presentation transcript:

1 SMALLESTLARGEST UNIVERSE TIME SPACE EVERYTHING SOLAR SYSTEM STARSGALAXIES MILKY WAY PLANETS OTHER CRAP SUN NORTH STAR

2 Thought Question: If you could see stars during the day, this is what the sky would look like at noon on a given day. The Sun is near the stars of the constellation Gemini. Near which constellation would you expect the Sun to be located at sunset? A.Leo B.Cancer C.Gemini D.Taurus E.Pisces

3 Thought Question Which of the following describes when constellations are visible from San Diego (if it is dark enough and the clouds cooperate)? A.You could observe any constellation tonight at midnight. B.You could observe any constellation sometime during the night. C.You could observe any constellation on some night during the next year. D.Some constellations will never be visible from here.

4 NORTH STAR CONSTELLATIONS: for orienting ourselves in the sky:

5 Being a Good Astronomer Complications in finding things: Earth is a sphere (people in different places see different stars) Earth rotates (stars continually move across sky) Earth orbits the Sun (stars don’t appear in same place from month to month) Some of our targets are moving too… ATMOSPHERE

6 Being a Good Astronomer High in the sky is best because… the more atmosphere you have to look through: the more light is blocked the more the colors are affected ATMOSPHERE HIGH ALTITUDE LOW ALTITUDE

7 Where in the Sky? To describe position in sky, need two coordinates: Altitude (ALT): angle above horizon 0º: horizon 90º: zenith Direction (DIR): angle clockwise from N measured around horizon 0º: N 180º: S 90º: E 270º: W NORTH STAR S N E W N E W S ZENITH

8 Being a Good Astronomer Best telescopes usually scheduled months in advance: must be able to predict when an object will be up light from Sun, Moon should not interfere ATMOSPHERE

9 Stars Move?

10 Thought Question In the past, several TV shows (NBC Nightly News, The Daily Show) had opening graphics which showed the Earth spinning the wrong way. If you were watching Earth from a stationary position out in space (as shown below), what direction does it spin? A.Left to right B.Right to left

11 Celestial Sphere Stars appear to move as if attached to a sphere rotating around Earth Celestial poles: above Earth’s N and S poles Celestial equator: directly above Earth’s equator

12 Earth Surface Coordinates SOUTH POLE 90º S NORTH POLE 90º N EQUATOR 0º

13 Celestial Coordinates SOUTH CELESTIAL POLE NORTH CELESTIAL POLE CELESTIAL EQUATOR DECLINATION LINES SOUTH CELESTIAL POLE NORTH CELESTIAL POLE RIGHT ASCENSION LINES

14 Celestial Coordinates declination (DEC): like latitude on Earth north celestial pole: +90º celestial equator: 0º south celestial pole: -90º right ascension (RA): like longitude on Earth BUT… counted in hrs, increases toward east north celestial pole

15 The Sky from San Diego Most stars rise in east half of sky, and set in west half: NORTH CELESTIAL POLE LOOKING SOUTH N W S E HORIZON circumpolar: stars that don’t rise or set for a person LOOKING NORTH  stars circle in 23h56m

16 Thought Question If you watched the star pictured below from San Diego over several hours, what would happen? A.Its altitude and direction wouldn’t change. B.Its altitude would change, but direction wouldn’t. C.Its direction would change, but altitude wouldn’t. D.Both its direction and altitude would change. HORIZON N E W S

17 Using a Telescope A telescope pointing at one ALT and DIR doesn’t move BUT a star’s ALT and DIR both change during night Is there a better way?

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