motion of the planets. exam on monday i’ll have a mock exam to work on friday
TRANSCRIPT
![Page 1: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/1.jpg)
Motion of the Planets
![Page 2: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/2.jpg)
EXAM ON MONDAY
I’ll have a Mock exam to work on Friday
![Page 3: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/3.jpg)
Solar Eclipse
• Freds_excellent_eclipse.mpg
![Page 4: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/4.jpg)
Solar Eclipses
• Umbra – region of total shadow• Penumbra – region of partial shadow• Totality lasts only a few minutes!• Why isn’t there a solar eclipse every month?
![Page 5: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/5.jpg)
Solar Corona
![Page 6: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/6.jpg)
Inside the Umbra
![Page 7: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/7.jpg)
Annular Eclipse1
3
2
![Page 8: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/8.jpg)
Lunar Eclipses Moon moves into
earth’s shadow…
…and out of it
(takes hours!)
![Page 9: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/9.jpg)
Don’t miss the eclipse in 2 weeks• Rare Celestial Event Won't Happen Again Until
2033
![Page 10: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/10.jpg)
![Page 11: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/11.jpg)
Partial Eclipse
![Page 12: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/12.jpg)
Not an Eclipse !
![Page 13: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/13.jpg)
Towards Totality
![Page 14: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/14.jpg)
Almost total…
![Page 15: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/15.jpg)
Totality
Totality
![Page 16: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/16.jpg)
Moon’s orbit is tilted wrt the ecliptic
![Page 17: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/17.jpg)
Activity: Moon Phases
• Pick up a worksheet• Form a group of 3-4 people• Work on the questions on the sheet• Fill out the sheet and put your name on top• Hold on to the sheet until we’ve talked
about the correct answers• I’ll come around to help out !
![Page 18: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/18.jpg)
“Strange” motion of the Planets
Planets usually move from W to E relative to the stars, but sometimes strangely turn around in a loop, the so-called retrograde motion
![Page 19: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/19.jpg)
MARS AND URANUSSEE SKYGAZER: PATH OF THE PLANETS
Tunc Tezel
brighter, loopy
dimmer,straight
dimmer, straight
![Page 20: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/20.jpg)
MARS 2005
Simulation of Mars 2003 is also on this Webpage by C. Seligman
![Page 21: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/21.jpg)
Apparent Motion of Planets in the Sky
• Here: Mars relative to (the stars of) Aquarius
• Note that Mars and Taurus would rise and set many times while this motion of Mars with respect to Aquarius happens!
(by Eugene Alvin Villar)
![Page 22: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/22.jpg)
Confusion
• Don’t confuse “orbit” with “path in the sky”• Potentially confusing, double meaning of “South”, etc.
– “North” and “South” are used in two different coordinate systems• Equatorial (fixed stars): North means “closer to the CNP”• Observer (horizon, stars not fixed, move from E to W):
North means on the line that goes from the horizon via Polaris to the Zenith
• Oddly enough, northern stars (stars “above” the celestial equator) as well as southern stars, culminate in the south!
– Helpful Simulation
![Page 23: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/23.jpg)
To Zenith if Midnight
East West
larger smaller
RA RA
RA
CNP, larger declination
![Page 24: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/24.jpg)
Naked-Eye Observation of the Planets
• The planets change their position with respect to the stars
• The planets, unlike the Sun and the Moon, show retrograde motion
• The planets get brighter and dimmer– They are brightest when they are in retrograde
motion• This must mean that they are closest to us at this
point (Why?)
![Page 25: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/25.jpg)
What can we conclude from observing patterns in the sky?
• Earth OR Celestial Sphere rotates• Earth rotates around the Sun OR Sun moves
about Earth• Moon rotates around the Earth or v.v.?
– Must be former, due to moon phases observed!
• Size of the earth from two observers at different locations
• Size of moon & moon’s orbit from eclipses
![Page 26: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/26.jpg)
Jupiter Motion: Slow, about 1 constellation a year: 12 years for the
Zodiac!
Invisible because Sun is also here in Feb/March
![Page 27: Motion of the Planets. EXAM ON MONDAY I’ll have a Mock exam to work on Friday](https://reader031.vdocument.in/reader031/viewer/2022032006/56649edb5503460f94bea971/html5/thumbnails/27.jpg)
Activity: Retrograde Motion
• Pick up a worksheet• Form a group of 3-4 people• Work on the questions on the sheet• Fill out the sheet and put your name on top• Hold on to the sheet until we’ve talked
about the correct answers• I’ll come around to help out !