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54 Cards in this Set

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Constellation is Latin for
Group of Stars
There are __ recognized constellations
88
3 famous constellations:
Orion
Ursa Major - the big dipper
Ursa Minor - the little dipper
Name for "The North Star"
Polaris
It is always easiest to learn constellations by understanding their
relative positions.
Diurnal Motion:
the rotation of the earth, this causes the stars to change during a night.
Stars rise in the ____ and set in the ____.
East, West
________ is a star CLUSTER
Pleiades
_____ is a CONSTELLATION
Orion
Due to a __ degree tip of the earth's axis in respect to the sun, the sun doesn't follow the Celestial Equator
23
The path troughout the year is called the ________
Ecliptic
The ecliptic crosses the celestial equator at two points in the sky called the ______ and ________ equinox.
Vernal and Autumnal Equinox (Mar. 21 and Sept. 21)
The sun is above the Celestial Equator for ____ the year and below it during the other ____.
Half, Half.
The day the sun is the highest in the northern sky is called the ______ solstice
Summer (June 21)
The day the sun is the lowest is called the ______ solstace
Winter (Dec 21)
Summer officially starts on the summer ________.
Solstice.
Why is it warmer in the summer?
In summer, the light is more direct.
In winter, the light is more spread out.
RA =
Right ascension
RA is measured about the Celestial Equator in units of _____, _______, and _______.
Hours, minutes and seconds.
There are __ hours around the sky.
24
The zero point is defined as the ______ equinox.
Vernal
Declination is measured in _______, _______, and _______.
DEGREES, minutes and seconds.
We measure the _____ above or below the Celestial Equator.
ANGLE
The celestial poles are at __ degrees N and S.
90
We can note the direction as either N or S, or by + or - T/F
T
The wobble and gravitational pull of the sun and moon on the earth causes the celestial poles and celestial equator to slowly change positions, this is called the:
Precession of the Equinox.
T/F - the Polaris was always the north star, and will continue to be so in the future.
F
The wobble has a period of __,___ years.
26,000
The Zenith:
The point directly over your head
The Meridian
A line running through the zenith from the north to the south, this line is used to define sidereal (or Star) time.
Solar Time means
The time we base off of our watches
Star time
The time it takes the stars to go from due south to due south.
Our current calendar system is the
Gregorian Calendar
If the moon passes throught eshadow of the earth it is a _____ Eclipse
Lunar
If the shadow of the moon moves across the earth's surface, it is _____ eclipse.
Solar
Umbra
The shadow of the moon on the earth
Penumbra
The shadow outside the Umbra (less intense)
The wobble has a period of __,___ years.
26,000
The Zenith:
The point directly over your head
The Meridian
A line running through the zenith from the north to the south, this line is used to define sidereal (or Star) time.
Solar Time means
The time we base off of our watches
Star time
The time it takes the stars to go from due south to due south.
Our current calendar system is the
Gregorian Calendar
If the moon passes throught eshadow of the earth it is a _____ Eclipse
Lunar
If the shadow of the moon moves across the earth's surface, it is _____ eclipse.
Solar
Umbra
The shadow of the moon on the earth
Penumbra
The shadow outside the Umbra (less intense)
There are 3 types of eclipses
Total Solar
Partial Solar
Annular Eclipse
Total Solar Eclipse
Moon fully blocks the visible solar surface
You must be in the umbra to observe the solar atmosphere
Partial solar eclipse
Only part of the sun is blocked
You must be in the penumbra to observe a partial eclipse
Annular Eclipse
The moon is at apogee (furthest from the earth)
THe moon is not large enought to cover the solar disk at this distance
The moon leaves a ring of the visible solar survace observable.
Why don't we see an eclipse every month?
The moon doesn't orbit in the Earth-Sun plane, the orbit is tipped 5 degrees to that plane.
The intersection of the earth's orbit is called the
Line of Nodes
Eclipses occur when line of nodes is closely lined up with the
Earth-Sun orbital plane