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Astronomy > Section 2 > Flashcards

Section 2 Flashcards

1
Q

Rotation

A

Turning on the axis

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2
Q

Revolution

A

Movement around a fixed point

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3
Q

Precession

A

Slight movement over a period of 26,000 years

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4
Q

Mean Solar Day

A

Aka Synodic; Measuring rotation by recording from one noon to the next

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5
Q

Sidereal Day

A

Measuring rotation by recording how long it takes to travel 360*

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6
Q

Perihelion

A

When Earth is closest to the Sun

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7
Q

Aphelion

A

When Earth is farthest from the Sun

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8
Q

Ecliptic

A

annual path of the Sun against the backdrop of the Celestial Sphere

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9
Q

Plane of the Ecliptic

A

Imaginary line connecting Earth’s orbit with the Celestial Sphere

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10
Q

Inclination

A

Angle between the equatorial and orbital planes

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11
Q

Equinox

A

Equal length of night and day

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12
Q

Solstice

A

When the Sun is farthest from Earth

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13
Q

Perigee

A

Moon is closest to Earth

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14
Q

Apogee

A

Moon is farthest from Earth

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15
Q

Phases of the Moon

A

Change is the amount of the moon that appears lit

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16
Q

Crescent

A

comes after the new moon

17
Q

Waxing

A

increasing visibility of the moon

18
Q

Waning

A

decreasing visibility of the moon

19
Q

Full Moon

A

complete view of the moon

20
Q

First Quarter Phase

A

half circle of the moon

21
Q

New Moon Phase

A

The moon disappears altogether

22
Q

Gibbous

A

moon more than half full

23
Q

Synodic Month

A

Period of 30 days

24
Q

Solar Eclipse

A

Sun light that is blocked by the moon

25
Q

Lunar Eclipse

A

Sun light blocked by the Earth suppose to shine on the moon

26
Q

Umbra

A

A celestial body covered by the shadow of another

27
Q

Preumbra

A

outer shadow that is lighter than the inside

Astronomy (5 decks)

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