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Solar System Flashcards

1
Q

Orbit

A

Elliptical

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2
Q

Solstices

A

21st June Summer - longest daylight hours Tropic of Cancer
21st Dec Winter - shortest daylight hours Tropic of Capricorn

23.5 degrees north and south

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3
Q

Earth is how many degrees off vertical axis

A

23.5

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4
Q

Equinoxes

A

21st of march and September

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5
Q

Declination

A

The same as latitude just in astronomers terms

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6
Q

Celestial Sphere

A

Where all the heavenly bodies are imagined to be projected on to.

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7
Q

Celestial EQ

A

Projection of earths EQ onto the celestial Sphere

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8
Q

Zenith

A

The uppermost part of anything

Position of a body directly overhead observer at 90 degrees

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9
Q

Local Hour Angle

A

Angular measurement from observers celestial meridian to a heavenly body. 0 degrees when overhead

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10
Q

Greenwich Hour Angle

A

Measured clockwise GHA

240GHA = 120 E

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11
Q

Kepler’s Laws

A

1 - The orbit of each planet is an ellipse

2 - Radius vector sweeps equal area in equal time

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12
Q

Perihelion

A

3rd Jan. - Closest to the sun and fastest moving

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13
Q

Aphelion

A

3rd July - Furthest from the sun slowest moving

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14
Q

Obliquely of Ecliptic

A

23.5 degrees is the angle between the ecliptic and the celestial EQ

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15
Q

Max Rate of Change of daylight hours

A

Equinoxes 21st of march and September

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16
Q

Minimum rate of change of daylight hours

A

Solstices 21st of July and December

17
Q

Sidereal Year

A

The time between 2 successive positions of earth, sun, and point in space - 365.6 days

18
Q

Tropical Year

A

Time between 2 successive vernal equinoxes (21st march) - relative to the first point of Aries

19
Q

How are leap years accounted for

A

Every 400 years, 3 leap years are ignored

20
Q

Sidereal Day

A

23hr 56mins Constant

21
Q

Apparent Solar Day

A

Time between 2 successive sun points over perpendicular meridian

22
Q

Mean Solar Day

A

24 hours constant

23
Q

Largest difference between apparent sun midday and mean solar day noon

A

Feb and Nov ~ 15 minutes

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