Day 2 notes Ch. 1 second half Motion of the Moon and eclipses.

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Presentation transcript:

Day 2 notes Ch. 1 second half Motion of the Moon and eclipses

Motion of the Moon and Phases of the Moon The development of the current model of the solar system began with careful measurement of the movement of the Sun and the Moon. To understand this, let’s review the motion and the phases of the Moon, as we currently understand them. When we watch the Moon, it’s shape changes from one night to the next:

From the astronomy picture of the day web site ( link )link

Earth and Moon, separately From Apollo 17 spacecraftFrom Earth

Earth and Moon, in one picture from the Galileo space probe as it traveled by the Earth on its way to Jupiter.

Lunar Phases

Lunar Eclipse (there are many good web resources) (link)(link)

Lunar Eclipse

Solar Eclipse

Solar Eclipse over China

Solar Eclipse over Zambia sequence of photos superimposed to show the movement of the Sun

Solar Eclipse over Antarctica

Solar Eclipse – composite picture

Solar Eclipse – composite picture (cropped)

Solar Eclipse Types

Penumbra and Umbra

Shadow of Moon seen from Mir space station

Animation of Moon eclipsing the Sun, as seen from inside the umbra.

Animation of the view from the dark side of the Moon, looking down on the Earth during a solar eclipse.

Eclipse Geometry is favorable close to the equinoxes.

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Web page at NASA devoted to this eclipse (link)link

Example of a map of the eclipse path, showing the center line and boundaries of the region under the umbra (total) For the total eclipse of 29 March 2006

Transits occur when a planet crosses between the Earth and the Sun, so we see a dark spot cross the Sun. This can only happen with Venus link or Mercury link.link Occultations occur when the Moon blocks out (occults) a planet. linklink

To do: Get the textbook. Finish Ch. 1. Start Ch. 2 ! Look at the syllabus and the dates. Mark your calendars for exam dates. First exam is exactly 2 weeks away! Enjoy the weekend.