Astro Qb - 2 Pp

Front 1

23.5°

Back 1

Earth's axis of rotation is tilted by ___

Front 2

Causing seasons

Back 2

The tilt is crucial in ___

Front 3

25,800 years

Back 3

The precession cycle

Front 4

Ophiuchus

Back 4

A 13th constellation

Front 5

Dec 21/22

Back 5

NH's winter solstice

Front 6

Sep 22/23

Back 6

NH's autumnal equinox

Front 7

June 21/22

Back 7

NH's summer solstice

Front 8

Mar 20/21

Back 8

NH's vernal equinox

Front 9

Dec 21/22

Back 9

SH's summer solstice

Front 10

Sep 22/23

Back 10

SH's vernal equinox

Front 11

June 21/22

Back 11

SH's winter solstice

Front 12

Mar 20/21

Back 12

SH's autumnal equinox

Front 13

June & Dec

Back 13

Solstice

Front 14

Solstice

Back 14

One hemisphere has its longest day, the other its shortest

Front 15

Mar & Sep

Back 15

Equinox

Front 16

Equinoxes

Back 16

Lengths of day & night are equal

Front 17

Solar Day

Back 17

Length of time the sun takes to return to its highest point in the sky

Front 18

Sidereal day

Back 18

Length of time it takes a star takes to return to its highest point in the sky on successive days

Front 19

4 minutes shorter

Back 19

Sidereal day is _____ shorter than a solar day

Front 20

Lunar month

Back 20

A complete cycle of a moon

Front 21

29.5 solar days

Back 21

Days in lunar month

Front 22

Sidereal month

Back 22

Moon's orbit relative to the background stars

Front 23

27.3 solar days

Back 23

Days in a sidereal month

Front 24

Waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, waning crescent, new moon

Back 24

Phases of the moon

Front 25

Lunar eclipse

Back 25

Moon moves into Earth's shadow

Front 26

Lunar eclipse

Back 26

Moon moves into Earth's shadow

Front 27

2 or 3 times a year

Back 27

Lunar eclipse happens

Front 28

Always during a full moon

Back 28

Lunar eclipses happen during a ____

Front 29

Solar eclipse

Back 29

Moon blocks sunlight from reaching a part of Earth's surface

Front 30

3 types of lunar eclipse

Back 30

Penumbral, partial, total

Front 31

Penumbral lunar eclipse

Back 31

Moon passes through Earth's penumbra (part-shadow) leading to only a slight dimming of the moon

Front 32

Partial lunar eclipse

Back 32

A portion of the moon passes through Earth's umbra (full shadow)

Front 33

Total lunar eclipse

Back 33

The whole moon passes through the umbra

Front 34

Types of solar eclipse

Back 34

Total, partial, annular

Front 35

Total solar eclipse

Back 35

Produces a path of totality

Front 36

Path of totality

Back 36

A strip of Earth's surface where it can be seen that the sun is totally obscured

Front 37

Path of totality

Back 37

A strip of Earth's surface where it can be seen that the sun is totally obscured

Front 38

Total solar eclipse

Back 38

Sun's corona is visible

Front 39

Once every 18 months

Back 39

Total solar eclipse happens ....

Front 40

Partial solar eclipse

Back 40

The sun is only partly obscured (area of partial eclipse)

Front 41

Annular solar eclipse

Back 41

When the moon is farthee than average, so that its disk is too small to cover the sun's disk totally

Front 42

Central umbra

Back 42

Associated with the area of totality

Front 43

Penumbra

Back 43

Associated with area of partial eclipse

Front 44

Inferior planets

Back 44

Planets orbit closer to the sun than earth

Mercury and Venus

Front 45

Maximum elongation

Back 45

Greatest angle by which the planets stray from the sun

Front 46

28°

Back 46

Mercury's maximum elongation

Front 47

45°

Back 47

Venus' maximum elongation

Front 48

Superior planets

Back 48

All other planets from Mars outwards

Front 49

Johannes Kepler

Back 49

Discovered the laws of planetary motion

Front 50

Retrograde motion

Back 50

A planet moves from east to west

An effect of changing perspectives

Front 51

West to east

Back 51

Usual motion of planets against background stars

Front 52

Opposition

Back 52

When Earth moves between superior planets and the sun

Front 53

The zodiac

Back 53

Planets never stray from the band in the sky called

Front 54

Planetary conjunction

Back 54

Occurs when two or more planets appear close in the sky arranged roughly in a line

Front 55

Transit

Back 55

Occurs when an inferior planet comes directly between Earth & the Sun, passing across the sun's disk

Front 56

Transit

Back 56

Occurs when an inferior planet comes directly between Earth & the Sun, passing across the sun's disk

Front 57

8 years, once a century

Back 57

A pair of Venus transits, .... apart, recurs about ....

Front 58

12 times a century

Back 58

Mercury transits

Front 59

Occultation

Back 59

One celestial body passing in front of and hiding another

Front 60

Approximately every sidereal month

Back 60

Occultation happens....

Front 61

Approximately every sidereal month

Back 61

Occultation happens....

Front 62

A few times a century

Back 62

Occultation of 1 planet by another

Front 63

10-11 times a year

Back 63

Occultation of planets by the Moon