New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Astronomy 8/22-8/24

by: Allison Blevins

Astronomy 8/22-8/24 PHYS 107

Marketplace > University of Louisville > PHYS 107 > Astronomy 8 22 8 24
Allison Blevins
U of L
View Full Document for 0 Karma

View Full Document


Unlock These Notes for FREE

Enter your email below and we will instantly email you these Notes for ELEMENTARY ASTRONOMY

(Limited time offer)

Unlock Notes

Already have a StudySoup account? Login here

Unlock FREE Class Notes

Enter your email below to receive ELEMENTARY ASTRONOMY notes

Everyone needs better class notes. Enter your email and we will send you notes for this class for free.

Unlock FREE notes

About this Document

These are compressed notes from the power-points that he uploads onto Blackboard. Again, these are simplified and re-written (as are all of my notes). I am trying my best not to use the exact defin...
James Lauroesch
Class Notes





Popular in Department

This 2 page Class Notes was uploaded by Allison Blevins on Monday August 29, 2016. The Class Notes belongs to PHYS 107 at University of Louisville taught by James Lauroesch in Fall 2016. Since its upload, it has received 89 views.


Reviews for Astronomy 8/22-8/24


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 08/29/16
Astronomy Notes 8/22 • Astronomy/Astrophysics:As seen from Earth, the position of the stars and planets.Also the study of the beginning of evolution, the universe, and galaxies. Earth: Diameter: 7925 miles/ Circumference: 24900 miles/ 12750 km 40075 km Sun: • Diameter: 865000 Astronomical unit: The mean miles/ 1380000 km distance from the Earth to the Sun. (93000000 miles) • 110x the size of the Earth • Speed of Light:186000 miles per second. The distance from the Sun to the Earth is approximately 500 seconds or 8.3 minutes. • Closest star:Alpha Centauri System is 4.3 light years away. Milky Way: Our galaxy Diameter: 100000 light 6.3 billion times the distance years from the Sun to Earth • Closest galaxy:Andromeda.About 2.5 million light years away. Astronomy notes 8/24 • The Celestial Sphere: An imaginary sphere that surrounds the Earth that acts as a plane for stars to follow from east to west. • Horizon: Imaginary line separating what is in your vision and what is not. • Celestial Poles: The point(s) at which the stars appear to rotate. NCP: North Celestial Pole. SCP South Celestial Pole. Stars not near the poles will rise in the east and set in the west due to the rotation of the Earth. ◦ If you live exactly in a pole (north or south,) half of the sky will always be visible from your location. • Celestial Equator: Stars move parallel to this. It is an imaginary line that goes through the east and west points on the horizon. Essentially cutting the horizon in half. Latitudinal. ◦ Over the course of a solar day, if you live at the equator, you can see the entire sky at that location. • Zenith: The point that is directly over your head at any given position you are in. • Meridian: Longitudinal. Imaginary circle that wraps around the Earth that passes through the Celestial Poles (North and south points) and your zenith. The meridian marks the highest and lowest points a star will reach during its movement. • Circumpolar stars: These are stars that stay in the same place in the sky and never set. For example, in the southern hemisphere, stars near the SCP will be circumpolar and always stay above the horizon.Also, some stars are never visible. For example, in the southern hemisphere, stars near the NCP will never be seen from that position (never above horizon.) • Latitude: 90° – -90° from your position of the equator north or south. You can use this to measure how close a star is to being circumpolar. • (Mean) Solar Day: 24 hours. This is the time it takes the sun to rise/set, and then reappear in the same spot on the local meridian. • Sidereal Time: The time it takes for the Earth to rotate around it's axis 360°. It is also approximately the same amount of time it takes for a star to reappear in the same spot in the sky. Sidereal time and a solar day are not equal! ◦ The time difference between a solar day and a sidereal day is ~4 minutes. This causes the stars to rise earlier every day, which eventually causes daylight saving time.


Buy Material

Are you sure you want to buy this material for

0 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"

Allison Fischer University of Alabama

"I signed up to be an Elite Notetaker with 2 of my sorority sisters this semester. We just posted our notes weekly and were each making over $600 per month. I LOVE StudySoup!"

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.