Flashcards - The Earth, Sky, and Moon

Flashcards - The Earth, Sky, and Moon
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arc minutes
A minute of arc, arcminute , arc minute, or minute arc is a unit of angular measurement equal to 1/60 of one degree
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angular diameter
The angular diameter or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view
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magnetosphere
A magnetosphere is the region of space surrounding an astronomical object in which charged particles are controlled by that object's magnetic field
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aurora australis
An aurora, sometimes referred to as a polar light, is a natural light display in the sky, predominantly seen in the high latitude regions
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photosphere
The photosphere is a star's outer shell from which light is radiated
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chromosphere
The chromosphere is the second of the three main layers in the Sun's atmosphere and is roughly 3,000 to 5,000 kilometers deep
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lunar eclipse
A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra
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prism
PRISM is a clandestine surveillance program under which the United States National Security Agency collects internet communications from at least nine major US internet companies
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degree
A degree , usually denoted by ° , is a measurement of plane angle, defined by representing a full rotation as 360 degrees
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celestial sphere
In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with Earth
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celestial sphere
In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with Earth
degree
A degree , usually denoted by ° , is a measurement of plane angle, defined by representing a full rotation as 360 degrees
prism
PRISM is a clandestine surveillance program under which the United States National Security Agency collects internet communications from at least nine major US internet companies
lunar eclipse
A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra
chromosphere
The chromosphere is the second of the three main layers in the Sun's atmosphere and is roughly 3,000 to 5,000 kilometers deep
photosphere
The photosphere is a star's outer shell from which light is radiated
aurora australis
An aurora, sometimes referred to as a polar light, is a natural light display in the sky, predominantly seen in the high latitude regions
magnetosphere
A magnetosphere is the region of space surrounding an astronomical object in which charged particles are controlled by that object's magnetic field
angular diameter
The angular diameter or apparent size is an angular measurement describing how large a sphere or circle appears from a given point of view
arc minutes
A minute of arc, arcminute , arc minute, or minute arc is a unit of angular measurement equal to 1/60 of one degree
solar eclipse
As seen from the Earth, a solar eclipse is a type of eclipse that occurs when the Moon passes between the Sun and Earth, and the Moon fully or partially blocks the Sun
horizon system
The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane
Declination
In astronomy, declination is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle
equatorial system
The equatorial coordinate system is a celestial coordinate system widely used to specify the positions of celestial objects
tidal force
The tidal force is a secondary effect of the force of gravity and is responsible for the tides
Tides
Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth
perihelion
The perihelion is the point in the orbit of a planet, minor planet, or comet, where it is nearest to its orbital focus, generally a star
solstice
A solstice is an astronomical event that occurs twice each year as the Sun reaches its highest or lowest excursion relative to the celestial equator on the celestial sphere
winter solstice
Winter solstice is an astronomical phenomenon marking the shortest day and the longest night of the year
Sun
The Sun is the star at the center of the Solar System

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