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Who's Who
Definitions
Measurements
Miscellaneous
Telescopes
100
He sucessfully explained why the phases of the moon and eclipses occur, and correctly argued that Earth is a sphere.
Who is Aristotle?
100
The time it takes for the Earth to rotate on its axes once.
What is a day?
100
The measure of how far east an object in the sky is from the vernal equinox.
What is Right Ascension?
100
An imaginary circle created by extending the Earth's equator into space.
What is the celestial equator?
100
This telescope uses mirrors to focus the light.
What is Reflecting Telescopes?
200
According to this man the Earth is the center of the universe.
Who is Ptolemy?
200
The time required for the earth to orbit the Sun once.
What is a year?
200
An object in the sky's angular distance above the horizon.
What is altitude?
200
The point at which the sun appears on the first day of spring.
What is vernal equinox?
200
This telescope uses a set of lenses to gather and focus light.
What is a Refracting telescope?
300
While this was an unpopular theory at the time, this man thought the sun was the center of the solar system.
Who is Copernicus?
300
Most calendars organize time within a single unit.
What is a year?
300
The measure of how north or south an object is from the celestial equator.
What is declination?
300
These can be seen all night long during the entire year because they are above the Earth's axes.
What is circumpolar stars?
300
The best place on Earth for an astronomer to observe the sky and take measurements.
What is a mountaintop?
400
He explained why planets orbit the Sun.
Who is Newton?
400
The amount of time it takes for the moon to orbit the EArth once.
What is a month?
400
The line where the sky and Earth appear to meet.
What is the horizon?
400
You can measure the altitude of a star by measuring the angle between your horizon and the star using this instrument.
What is an astrolabe?
400
Astronomers have put telescopes here to avoid light pollution, water vapor and atmospheric interference.
What is space?
500
This man stated that all the planets revolve around the sun in elliptical orbits and that the sun is not in the exact center of the orbits.
Who is Kepler?
500
The year in which an extra day is added to it.
What is a Leap Year?
500
An imaginary point in the sky directly above an observer on Earth.
What is Zenith?
500
The apparent path of the sun across the celestial sphere as seen from Earth.
What is ecliptic?
500
Most astronomers use this type of telescope when wanting to make a very large telescope.
What is a reflecting telescope?