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Astronomy 0089 > Chapter 4 > Flashcards

Chapter 4 Flashcards

1
Q

What is Latitude?

A

Declination in degrees (N-S)

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2
Q

What is Longitude?

A

Right Ascension in hour (E-W (from Vernal Equinox)

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3
Q

What is the horizon?

A

Unique in each location/time.

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4
Q

What is the Meridian?

A

line from N-S through zenith, its cuts the sky in half. (Unique in each location)

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5
Q

What is the Nadir?

A

It is the point directly below you (Opp of Zenith) (Unique in each location)

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6
Q

What is the origin?

A

The ‘Zero’ point of the celestial coordinate system.

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7
Q

What is the Vernal Equinox?

A

Point in space where the celestial equator and the ecliptic intersect in March (RA = 0h, Dec = 0)

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8
Q

What happens with the Sun in the summer?

A

It’s light hits the earth at a more direct (no spread, more effective)

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9
Q

What happens with the Sun in the winter?

A

It’s light hits the earth at an angle (lots more spread, less effective)

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10
Q

What is the Equinox?

A

Equal night and day, the ecliptic and equator intersect.

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11
Q

What/When is the Summer Solstice?

A

June 21st, sun farther N (longest day)

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12
Q

What/When is the Autumnal Equinox?

A

September 21st, sun on celestial equator (moving S)

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13
Q

What/When is the Winter Solstice?

A

December 21st, Sun farther S (shortest day)

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14
Q

What/When is the Vernal Equinox?

A

March 21, Sun on celestial equator (moving N)

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15
Q

When/What is the New Moon?

A

Rises/Sets with sun, Day 1, Can’t see it

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16
Q

When/What is the 1st Quarter Moon?

A

Rises when the sun is halfway across the sky (midday), Day 7, Left side is Dark

17
Q

When/What is the Full Moon?

A

Rises when the sun sets, day 14, See all of it

18
Q

When/What is the 3rd Quarter Moon?

A

Rises halfway through the night (midnight), day 22, Right side is dark

19
Q

What is Waxing?

A

It gets “bigger”, left side is dark.

20
Q

What is Waning?

A

It gets “Smaller”, right side is dark.

21
Q

What is the Moon’s Synchronous Rotation?

A

The moon makes 1 orbit around the Earth and spins once on axis in the same time (one monthish)

22
Q

What is the Lunar Eclipse?

A

The sun and moon are on the opposite sides of the Earth, the moon travels through the Earth’s shadow (quite common).

23
Q

What is a Penumbral Eclipse?

A

Barley is covered by shadow.

24
Q

What is a Partial Eclipse?

A

Kinda covered by the shadow.

25
Q

What is a Total Eclipse?

A

All of it is covered.

26
Q

Why is it seen as Red?

A

The blue light is filtered by the Earth’s atmosphere.

27
Q

What is a Total Solar Eclipse?

A

The moon covers the sun in the darkest part of its shadow, which happens at the new moon.

28
Q

What is an Annular Solar Eclipse?

A

The Moon is at the furthest position, cone of shadow does not reach the Earth. (circle not annual)

Astronomy 0089 (15 decks)

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