Earth Systems
The rigid outer layer of the Earth, composed mostly of solid rock.
What is the Lithosphere?
An Earth-centered universe.
What is geocentric?
Perihelion
What is the point on the orbit of a planet, asteroid or comet around a sun when it is closest to the sun.
New Moon
What is the phase of the moon that occurs when the sunlit side of the moon is facing away from earth?
The Solar calendar introduced in 46 BC and used in Western societies until it was replaced.
What is the Julian Calendar?
Earth is surrounded by a layer of gasses called this.
What is Atmosphere?
A Sun centered planetary system model.
What is the Heliocentric model?
The plane in which Earth orbits the sun.
What is Ecliptic?
A couple of days after the new moon, the moon has advanced in its orbit around Earth, and a thin sliver is visible in the western sky just after sunset.
What is the waxing crescent?
Umbra
What is the darkest, inner part of a shadow? During a solar eclipse, the moon completely blocks the sun within the umbra.
The part of the Earth made up of water, including liquid, gas and solid.
What is the hydrosphere?
Habitable Zone
What is the region around a star in which liquid water can exist on the surface of planets, and which therefore can support advanced life.
The point on orbit of a planet, comet or asteroid around the sun in which it is farthest from the sun.
What is aphelion?
Waning Gibbous
What is a few days after the full moon, darkness starts to slowly creep across the moon's face from right to left?
Tropic of Capricorn.
What is the latitude in the Southern Hemisphere where the sun climbs up to directly overhead at noon on the summer solstice?
This is made up of all living organisms together with their environments in which they live.
What is the Biosphere?
The collection of all matter and energy that exists, as well as space and time themselves.
What is the universe?
The moment of time when the sun is highest in the sky in the hemisphere and regarded as the first day of summer.
What is summer solstice?
Occur when Earth's shadow covers the face of the moon.
What is a Lunar Eclipse?
The Spiral galaxy that our solar system is located in.
What is the Milky Way?
This gas has the highest concentration of all gasses in Earth's atmosphere.
What is Nitrogen?
A massive system of stars gravitationally bound to one another.
What is a galaxy?
Equinoxes
What are when Earth's axis neither tilts away nor toward the sun, and there is approximately and equal amount of daylight and nighttime?
Lunar Phase
What is the shape of the sunlit portion of the moon's face as seen from Earth?
A calendar based on both the phases of the moon and the orbit of Earth around the Sun.
What is the lunisolar calendar?