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Earth Science - Astronomy (ch. 18)

Across
Telescopes that use a set of lenses to gather and focus light.
The angle between an object and the horizon.
The apparent path the sun takes across the celestial sphere each year, as seen from Earth.
Sections of the sky that contain recognizable star patterns.
An imaginary point in the sky directly above an observer on Earth.
Made up of all the wavelengths of electromagnetic radiation.
In 1609 became the first astronomer to use a telescope to observe celestial objects.
Polish astronomer who was the first to theorize that the sun was actually the center of the universe.
The time that is required for the Earth to rotate once along its axis.
The line where the sky and the Earth meet.
The study of all physical objects beyond the Earth.
Roughly the amount of time required for the moon to orbit the Earth once.
The point at which the sun appears on the first day of spring.
Down
Telescopes that use curved mirrors to gather and focus light.
A year in which an extra day is added to the calendar.
Danish astronomer who who used several large tools to make some of the first main observations of the night sky.
Greek astronomer who thought that the Earth was the center of the universe and the other planets revolved around it.
A measure of how far east an object appears on the first day of spring.
Scientist who explained why planets orbit and why moons orbit planets.
An imaginary circle created by extending Earth's equator into space.
A unit of length equal to the distance that light travels through space in 1 year.
A measure of how far north or south an object is from the celestial equator.
A system for organizing time.
The amount of time required for Earth to orbit the sun once.