Astronomy 1010-HFall_2015Day-10

Planetary Astronomy

Course Announcements• SW chapter 2 – due Monday 9/21; 2pm• How is the lunar observing going?• How is the sunset/sunrise observing going?• 1st Quarter night – Mon. 9/21 -7:30pm – on campus• Exam 1: Mon. Sept. 21• This Week: APSU-OUR: Research & Creative Activity

Week. Events in the library 2:30-3:30 every day.

Spacecraft Reports• Chantal H. – New Horizons• Ashley G. – Dawn• Mahalia S. – NuStar• Tristan C. – Mangalyaan• Spencer B. – Voyager• Arielle P. – Curiosity Rover• Lars A. – Cassini• Sarah E. – Rosetta• John M. – Mars Phoenix• Jordan T. – Galileo• Rashun B. – Apollo Missions

The moon takes the same amount of time to complete one rotation as it does to complete one orbit

Cycle of phases:The synodic month 29.53 days

The Orbital Period is the Sidereal Month: 27.32 days

Lecture – TutorialCause of Moon Phases: pg 81

Work with a partner!Read the instructions and questions carefully.Discuss the concepts and your answers with

one another.Come to a consensus answer you both agree on.If you get stuck or are not sure of your answer,

ask another group.If you get really stuck or don’t understand what

the Lecture Tutorial is asking, ask one of us for help.

i_Clicker QuestionClassAction: Questions: Lunar Cycles: Phase Evolution; option 1

Lecture – TutorialPredicting Moon Phases: pg 85

Work with a partner!Read the instructions and questions carefully.Discuss the concepts and your answers with

one another.Come to a consensus answer you both agree on.If you get stuck or are not sure of your answer,

ask another group.If you get really stuck or don’t understand what

the Lecture Tutorial is asking, ask one of us for help.

i_Clicker QuestionClassAction: Questions: Lunar Cycles: Identify Lunar Position from Phase

i_Clicker QuestionClassAction: Questions: Lunar Cycles: Phases Visible; option 1

Stuff in Chapter 2• Coordinates• Position• Daily Motion (spin of Earth on its

axis)• Visibility of the sky• Year Motion (Earth orbits the Sun)• Seasons (tilt of the Earth’s axis)• Precession of the equinoxes• Motion and phases of the Moon• Eclipses

Three types of solar eclipses:• Total: The Moon

completely blocks the Sun’s light.

• Partial: Only part is blocked.

• Annular: The Sun appears as a bright ring surrounding the Moon.

Solar Eclipses

Solar eclipses happen at new Moon. Moon passes between Earth and the Sun. Only a small portion of Earth can witness

each one.

The part of the Moon’s shadow you are in determines which type of solar eclipse you see.

Umbra: Total or annular. Penumbra: Partial.

Lunar eclipses happen at full Moon. Earth is between the Sun and the

Moon. Visible over a wider area of Earth. Last a lot longer than solar eclipses.

Eclipses do not occur every month because the Moon’s orbit is tilted 5.2° with respect to Earth’s orbit around the Sun.

Intersection: line of nodes.

Next one is April 15, 2014 for

North America