▦ Intro to Astronomy
AW Ava Whitfield 🌐 English
Course outline
Intro to Astronomy
12 of 100 items · 12% of the course
1Foundations of Astronomy10 / 10Done
2The Earth, Moon & Celestial…2 / 13
▤Study Guide — Module 2Done
▶02 Module 2 Celestial…Done
▶02 Amazing Moon13m
▶02 Gravity and Orbits8m
▶02 Understanding Astron…8m
▶02 Bonus Binary Stars3m
▶02 Quantum Leap11m
▤Astronomy 2e — Ch. 3: Orbits…
▤Astronomy 2e — Ch. 4: Earth…
✎Predict the Sky, Then Explain…Overdue
3The Solar System0 / 24
4Stars & Their Life Cycles0 / 21
5Astronomy and Faith0 / 10
▶
02 Amazing Moon
Module 2 · Watch · 13 min
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SOLAR ECLIPSENEW MOON PHASE
❚❚ 1:52 / 12:39 CC⚙🔊⛶
Segments — click one to talk about it
1:52you would be actually looking in the same direction as the Sun…✦ Ask about this
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☰ Contents

Chapter 3: Orbits and Gravity

Figure 3.1 · International Space Station. This habitat and laboratory orbits Earth once every 90 minutes. (credit: modification of work by NASA)

Newton's laws showed that objects at rest stay at rest, and those in motion keep moving in a straight line unless acted on by a force. It is gravity that dictates the motion of the planets around the Sun.

3.1 The Laws of Planetary Motion

Learning objectives

By the end of this section, you will be able to:

  • Describe how Tycho Brahe and Johannes Kepler advanced our understanding of orbits.
  • State and apply Kepler's three laws of planetary motion.

Kepler's laws describe the shape and speed of a planet's orbit around the Sun — the geometry behind today's eclipse lecture.

Your assistant
Following 02 Amazing Moon
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I'm following along
02 Amazing Moon
I can help you get oriented, connect the key ideas, or check your understanding.
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You
What should I listen for in this lesson?

A wonderful question to start with. As you watch, listen for how the phases of the Moon line up with what we actually see in the sky1.

What to listen for
  • When the New Moon phase is named
  • Why an eclipse needs the Sun, Earth & Moon in a line2
Sources2 sources · Module 2
1ReadingAstronomy 2e — Ch. 3p. 178
2ReadingAstronomy 2e — Ch. 3p. 97
You
Got it — thank you!

Anytime. When the video wraps, say the word and I'll quiz you on the eclipse geometry.

Focused on Module 2 ✕
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