About This Chapter
The Earth, Sky, and Moon Basics - Chapter Summary
Work through this chapter on the earth, moon and sky at your own pace and on any mobile device or computer. As you study, you'll watch short videos on measuring objects in the sky, important points on the celestial sphere and the cycle of seasons in astronomy. Additional videos cover the geography of the four seasons and the magnetosphere. Once you complete this chapter, you should be ready to:
- Define precession and explain its meaning
- Outline the different types of lunar eclipses
- Explain what a solar eclipse is
- Discuss annular eclipses and the changing size of the moon
- Identify how an eclipse is predicted
- Detail how the moon, sun and gravity influence tides
- Outline tidal friction and its effects on the earth and the mooon
This chapter is designed to make studying for an exam simple and stress-free with handy and easy-to-access resources. Use the timeline feature to navigate the video lessons as needed, and take the lesson quizzes to ensure you've understood what you've learned. If you need assistance, our experts are available through the dashboard to answer your questions.
1. Measuring Objects in the Sky: Angular Size & Distance
This lesson will teach you about the celestial sphere, angular distance, angular size and diameter, arc minutes, and arc seconds. You'll also learn some neat tricks on how to use your own hands to measure these.
2. Important Points on the Celestial Sphere
This lesson will discuss some important points and lines located on the celestial sphere, including the zenith, nadir, celestial equator, meridian, and north and south celestial poles.
3. The Cycle of the Seasons in Astronomy
This lesson will explain to you why the Earth has different seasons, what the equinoxes and solstices are, their names, and if the distance the Earth is from the Sun influences the seasons.
4. Geography of the Four Seasons
This lesson will explain how the earth's axis and rotation affect seasons. In doing this, it will also highlight the concept of the summer and winter solstices, as well as how seasons vary around the globe.
5. What is Precession?
You've probably heard of the term precession. But what is this really? And what significance does it have to our night sky? This lesson will explain what it is and what it causes.
6. Lunar Eclipse: Definition & Types
This lesson will teach you about the lunar eclipse. You'll learn the difference between a penumbral, partial, and total lunar eclipse, and see what totality means with respect to a total lunar eclipse.
7. What Is a Solar Eclipse?
This lesson will describe what a solar eclipse is, why it's possible, when a partial or a total one will occur, and what cool effects occur during one.
8. Annular Eclipse: The Changing Size of the Moon
This lesson will explain what an annular eclipse is and why it occurs with respect to the sizes of the Moon, the Sun, and the position of the Moon during its orbit.
9. How Can We Predict An Eclipse?
This lesson will tell you when lunar and solar eclipses are possible, what nodes have to do with it, how long eclipse seasons last, and what the Saros cycle is.
10. Magnetosphere: Definition & Facts
In this lesson, you'll learn about how the northern lights are formed thanks to the magnetosphere and solar wind. Of course, you'll learn a lot more, including what the Van Allen belts, magnetopause, and magnetotail are.
11. How Gravity, the Moon & the Sun Influence Tides
This lesson will define tides, the tidal force, neap tide, and spring tide. It will also talk about how the sun, moon, and Earth interact to produce tidal bulges.
12. Tidal Friction: Effects on Earth & the Moon
This lesson will go over the concept of tidal friction, why it occurs, and how all of that has affected Earth's spin and day length, as well as the moon's rotation and distance from Earth.
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Other chapters within the DSST Astronomy: Study Guide & Test Prep course
- History of Astronomy Basics
- How Scientists Think and Work
- Overview of Light in Astronomy
- Overview of Newton's Laws in Astronomy
- The Orbits of Celestial Bodies
- The Moon: Formation & Phases
- The Sun's Structure & Components
- The Solar System: Layout, Formation & Dating
- Characteristics of Our Solar System's Planets
- Small Celestial Bodies & Satellites in Our Solar System
- Measurement of Star Qualities
- Star Types and Significance
- The Birth and Life of Stars
- Basics of Star Death
- Neutron Stars & Black Holes
- The Milky Way Galaxy
- Galaxies: Properties & Characteristics
- The Universe: Key Concepts & Theories
- Intro to Life in the Universe
- Celestial Navigation & Timekeeping
- Overview of Telescopes
- DSST Informational Resources
- DSST Astronomy Flashcards