1 / 10

Miscellaneous announcements…

Discover how stars change as you move to different latitudes on Earth and learn to measure the size of the Earth using the stars.

jarrodt
Download Presentation

Miscellaneous announcements…

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Miscellaneous announcements… • Get started on your first observing project. • Anyone interested in the astrophotography project? • No class Monday (happy Labor Day). • First homework is due Wednesday.

  2. The Stars from Different Latitudes 1 September 2006

  3. Today: • How the stars change as you move to different latitudes on earth • Using the stars to measure the size of the earth

  4. From other locations… • Longitude (E-W location) doesn’t matter, except to determine time of day • Latitude matters: For every 70 miles traveled north, northern stars get 1º higher, southern stars 1º lower • So a 360º shift would presumably take 360 x 70 miles, or 25,000 miles: the earth’s circumference!

  5. The Two-Sphere Universe • The earth is a much smaller sphere at the center of the celestial sphere. • As you move around on the earth, your horizon changes orientation so you see a different half of the celestial sphere. • This model dates back to ancient Greece, 2500 years ago.

  6. Alpha, beta Centauri, Crux

  7. Orion setting in Hawaii

  8. Dippers from Hawaii

  9. Kilimanjaro star trails (3º S)

  10. Southern hemisphere star trails

More Related