Chapter 2

Question 0

Waning

Answer 0

Decreasing

Question 1

Waxing

Answer 1

Increasing

Question 2

Lunar Eclipse

Answer 2

When the Earth lies directly between the Sun & Moon. Earth’s shadow falls on the Moon.

Question 3

Solar Eclipse

Answer 3

When the Moon lies directly between the Sun & Earth. Moon’s shadow on Earth.

Question 4

Umbra

Answer 4

Where sunlight is completely blocked

Question 5

Penumbra

Answer 5

Sunlight is partially blocked

Question 6

Total Lunar Eclipse

Answer 6

Moon through Earth’s umbra

Question 7

Partial lunar eclipse

Answer 7

Part of the moon through Earth’s umbra

Question 8

Penumbrial lunar eclipse

Answer 8

Only through the Earth’s penumbra. Most common.

Question 9

What is the path of the Sun?

Answer 9

Ecliptic on the celestial sphere.

Question 10

What causes precession?

Answer 10

Torques from other planets

Question 11

Proper motion of stars

Answer 11

Stars move relative to each other, constellations not fixed.

Question 12

When are the equinoxes?

What is the latitude?

Answer 12

March 21 & September 21

0 degrees

Question 13

When are the solstices?

Answer 13

December 21 & June 21

Question 14

Horizon

Answer 14

Boundary between Earth and Sky

Question 15

Zenith

Answer 15

Directly overhead

Question 16

Meridian

Answer 16

Imaginary line stretching from due South, through the zenith, to due North

Question 17

What are circumpolar stars?

Answer 17

Stars that never set.

Question 18

Define: Equinox

Answer 18

two points at which the hemispheres are equally illuminated

Question 19

Define: Solstice

Answer 19

two points at which sunlight becomes the most extreme for the two hemispheres

Question 20

How long is the lunar phase?

Answer 20

29.5 days

Question 21

What would you see if you lived on the moon and you looked at Earth when people on Earth saw a full moon?

Answer 21

A new Earth

Question 22

What phase of Earth would you see if you lived on the Moon during a crescent phase?

Answer 22

A gibbous Earth

Question 23

Why do stars rise and set?

Answer 23

Earth’s rotation makes it appear that way

Question 24

Why did the Greeks reject the real explanation for planetary motion?

Answer 24

Couldn’t detect stellar parallax

Question 25

Stellar Parallax

Answer 25

Apparent shift in position of a nearby star that occurs as we view the star from different positions in Earth’s orbit of the Sun each year.

Question 26

Apparent retrograde motion

Answer 26

The apparent motion of a planet during the period of a few weeks or months during which the planet appears to be moving westward relative to the stars in the sky.