These imaginary lines measure distance east and west of the Prime Meridian.
๐ What are lines of longitude?
These lines connect points of equal elevation.
๐ What are contour lines?
This astronomer refined the geocentric model with epicycles.
๐ Who is Claudius Ptolemy?
This model places the Sun at the center of the solar system.
๐ What is the heliocentric model?
This instrument allows astronomers to observe distant objects in space.
๐ What is a telescope?
This type of map shows natural features like mountains and rivers.
๐ What is a physical map?
A circular pattern of contour lines with increasing elevation indicates this landform.
๐ What is a hill (or mountain)?
This Earth-centered theory dominated for nearly 1,500 years.
๐ What is the geocentric model?
This Polish astronomer proposed the Sun-centered model.
๐ Who is Nicolaus Copernicus?
This Dutch eyeglass maker is credited with inventing the first practical telescope.
๐ Who is Hans Lippershey?
This map element explains symbols used on a map.
๐ What is a legend (map key)?
The difference in elevation between two contour lines is called this.
๐ What is contour interval
These circular motions were used to explain retrograde motion.
๐ What are epicycles?
This 1543 book introduced heliocentrism, written by Copernicus.
๐ What is De revolutionibus orbium coelestium?
This scientist improved Lippersheyโs invention for astronomical use.
๐ Who is Galileo Galilei?
This projection preserves shape but distorts size near the poles.
๐ What is the Mercator projection?
Widely spaced contour lines indicate this type of slope.
๐ What is a gentle slope?
This book by Claudius Ptolemy explained the geocentric universe.
๐ What is the Almagest?
This Italian astronomer supported heliocentrism with telescopic observations.
๐ Who is Galileo Galilei?
These four moons orbiting Jupiter were discovered by Galileo.
๐ What are Io, Europa, Ganymede, and Callisto?
This imaginary line at 0ยฐ longitude passes through Greenwich, England.
๐ What is the Prime Meridian?
This system of satellites helps determine precise location on Earth.
๐ What is GPS (Global Positioning System)?
This observed backward motion of planets puzzled ancient astronomers.
๐ What is retrograde motion?
This scientist used mathematics to improve Copernicusโs circular orbits into elliptical ones.
๐ Who is Johannes Kepler?
These dark spots observed by Galileo showed that the Sun was not perfect.
๐ What are sunspots?