GENERAL GEOLOGY (EARTH VALUES) Flashcards

1
Q

Astronomical Unit (Au)

A

150 Million Km

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2
Q

Circumference of Earth

A

40,075 km

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3
Q

Ave Distance of Moon to Earth

A

384,401 km

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4
Q

Zodiac

A

A band in the sky on which the sun, moon and starrs move along

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5
Q

Total number of constellation

A

88

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6
Q

Brightest star in Orion located SE

A

Rigel (Blue White)
Beta Orionis

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7
Q

Alpha Orionis

A

Betelgeuse (Red Supergiant)

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8
Q

Stars located at the sword of Orion

A

Trapezium or Orion Nebula

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9
Q

Brightest Star in Canis Majoris

A

Sirius

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10
Q

Current North Star

A

Polaris

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11
Q

Earth’s Equator:

A

Celestial Equator

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12
Q

Earth’s Latitude:

A

Declination

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13
Q

Earth’s Longtitude

A

Right Ascenision

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14
Q

Vernal equinox

A

The point in the sky where the sun crosses the celestial equator at the onset of spring (Mar 21)

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15
Q

1 Hour = how many dregees of earth’s Rotation?

A

15 degrees

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16
Q

Rotation

A

Spinning of a body on its axis

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17
Q

Revolution

A

the motion of body along a path around a point in space

18
Q

Axial Precession

A

the gradual change of the orientation of Earth’s Axis or the wobble

19
Q

Mean Solar Day

A

24 Hrs the time interval from one noon to the next

20
Q

Noon

A

the time when the sun has reached its highest point in the sky

21
Q

Sidereal Day

A

the time its takes for earth to complete a rotation relative to a reference star other the sun. Measured by conunting the time interval for a star to reappear on the same position in the sky

22
Q

length of sidereal day

A

23Hrs 56 mins 4 secs

23
Q

Mean Earth Speed

A

107000 Km/hr

24
Q

Distance from Earth to su

A

150 M km or 1 astronomical unit

25
Perihelion
147 M km on Jan 3
26
Aphelion
152 M km on July4
27
Ecliptic
Apparent annual path of the sun against the backdrop of celestial sphere or simply the apparent orbit of the sun
28
The alternate North Star due to precession that changes every 26,000 years
Vega
29
The time it takes for the sun to complete ts revolution around the galaxy
230 Million Years at 250 km per second
30
Mean distance of Moon toEarth
384,401 km
31
Synodic Month
29.5 days Apparet lunar revolution
32
Sidereal Month
27 1/3 days True revolution and Rotation of Moon around Earth
33
FACT
Moon Rotation and Revolution is equal that is the same lunar hemisphere is always seen on Earth
34
Solar Eclipse
New Moon Phase, Moon Casts shadow on Earth
35
Lunar Eclipse
Full Moon Phase, Moon pases on the shadow of Earth
36
Minimum number of eclipse in a year
4
37
Maximum number of eclipse in a year
7
38
Max duration of Lunar Eclipse
4 hours
39
Max duration of Solar Eclipse
7minutes only
40
Dark part of a shadow
Umbra
41
Light Part of a shadow
Penumbra
42
Kepler's Law of Planetary Motion
1) Elliptical Orbits 2) Law of Equal Area 3) Harmony of the worlds - Orbital period is proportional to their mean solar deistance