Announcements/ Assignments - JD Smith

[Pages:57]Announcements/ Assignments

Need syllabus/tickets/schedule? See me after class.

Finish reading Chapter 2

First graded online homework: "Homework #1" due Thursday, Sept. 10th before class. Available now.

Lecture notes are now posted on the course website.

Cell Phones off please!

M.A. Homework Notes

Reminder: Practice Homework is ungraded. "Overdue" is not an issue.

Late Homework: 10% off per day.

Grading: 2% bonus per hint not used (use them!). Only 3% off for wrong answers on "sorting"-type questions.

Still need help with ? See me after class.

Next Week: Planetarium Visit

During Class (no ticket needed).

Meet there (across the courtyard just outside the door).

Mon Sep 8th: Last Names A-K Wed Sep 10th: Last Names L-Z other group: meet here as usual!

Last Time

Earth's Rotation (once per day) causes sun/ stars/etc. to rise, transit at their highest point at the meridian, and then set. Zenith is the point directly overhead.

Stars you see depends on your latitude. Some stars are always up: they are circumpolar.

Constellations: Just random groupings of stars invented by humans.

The celestial sphere is an imaginary sphere where we place stars on a two dimensional grid, similar to latitude and longitude on earth.

Last Time

1 degree=60 arcminutes = 3600 arcseconds.

The "size" of objects in the sky is measured as an angle. Without knowing its distance, we can't know its true size.

From Toledo, you observe a star rising due east. When this star reaches its highest position above the horizon, where will it be?

A) high in the northern sky

B) high in the eastern sky

C) high in the southern sky

D) high in the western sky

E) directly overhead

From Toledo, you observe a star rising due east. When this star reaches its highest position above the horizon, where will it be?

A) high in the northern sky

B) high in the eastern sky

C) high in the

southern sky D) high in the

western sky E) directly overhead

Equator Star Trails

Imagine sitting at the equator at night as the Earth turns. What would the stars look like?

All stars rise and set

Horizon

Polaris is located on the horizon

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