equinox
The moment when the sun appears to cross the celestial equator.
solstice
The point at which the sun is as far north or as far south of the equator as possible.
aphelion
The point in a planet's orbit at which the planet is farthest from the sun.
perihelion
The point in a planet's orbit at which the planet is closest to the sun about 147 million km.
Coriolis effect
The curving of the path of wind belts and ocean currents is called.
Astronomical Unit
The average distance between Earth and the sun is
radio telescope
An instrument that detects invisible radio waves from objects in space
electromagnetic spectrum
All the frequencies or wavelengths of electromagnetic radiation
astronomy
The scientific study of the universe is called
galaxy
A large collection of stars, dust, and gas bound together by gravity
14 billion
The universe began about
solar system
What consists of all the planets, sun, comets and asteroids?
earth's rotation
A constellation's change in position over several hours is caused by.
Leap Year
Each complete revolution of Earth takes 365 1/4 days so every four years we add a day to the calendar called.
summer solstice
The Northern Hemisphere has the most hours of daylight at the.
big bang
The event which began the universe was the
Earth revolves around the sun
A constellation's changing position in the sky, at the same time of the evening, over a period of several weeks is evidence that
Earth rotates on its axis
The Coriolis effect provides evidence that
first human moon landing
What milestone in human space exploration took place in 1969?
elliptical
What is the shape of Earth's orbit around the sun?
rotation
What movement of Earth is responsible for night and day?
Earth's tilted axis
Seasons are caused by
23.5 degrees
Earth's axis is at a tilt of
experience interference from Earth's atmosphere
Telescopes have been sent to space because ground-based telescopes
Autumnal Equinox
The beginning of fall in the Northern Hemisphere is marked by the
Winter Solstice
The Northern Hemisphere has the fewest daylight hours at the
Vernal Equinox
The beginning of spring in the Northern Hemisphere is marked by the
September
The autumnal equinox occurs on the 22nd or 23rd of what month.
June
The summer solstice occurs on the 21st or 22nd of what month.
March
The vernal equinox occurs on the 21st or 22nd of what month.
December
The winter solstice occurs on the 21st or 22nd of what month.