Card Set Information
A Beka Science
what is the most important instrument used by astronomers
What technique is used to correct atmospheric distortion by computer controlled mirrors
what splits light into a spectrum for analysis
detects radio waves from space
Two basic kinds of optical telescopes?
the point on the celestial sphere directly above the observer
the point directly below an observe
circle on celestial sphere that connects both poles and passes directly over the observer
telescope that uses large, curved primary mirror
reflecting telescope (visible-light telescope)
telescope that uses a lens for the objective
color sequence formed when white light shines through a prism
amount of time the earth take to spin 360 degrees on it's axis
Equation of time is a relationship between mean solar time and __________?
apparent solar time
amount of time between two upper transits of the sun
apparent soar day
General term for the most basic unit of time
Unit of time based on how long the earth takes to orbit the sun one time
Unit of time NOT based on the motion of a heavenly body?
In the US, summer time is called?
Two points at which the path of the sun crosses the celestial equator?
Term for the points on the sun's path midway between the two equinoxes?
In what is time divided into years and months?
Name for the path the sun follows in a year?
What calendar is used most in Western nations?
What method of measuring time uses time zones?
standard solar time
Type of time based on the stars?
System of timekeeping that divides the day into hours A.M. and P.M.?
Used to study the heavens?
The abbreviation A.D. stands for?
Term referring to the earth's slow "wobble" on its axis that causes the pole star to change?
precession (of the equinoxes)
Term for the narrow, dark lines that sow between the broad spectrum of color when white light shines through a gas and then passes through a prism?
Name for mean solar time at Earth's prime meridian?
UTC (coordinated universal time)
From which calendar do the English months names come from?
What astronomical event marks the beginning of winter in the Northern Hemisphere?
Why do Julian and Gregorian calendars have leap years?
They have leap years because there is NOT a whole number of days in a solar year.
What part of the telescope collects the light?
Technique when scientists use multiple radio telescopes to produce images more detailed than possible with a single radio telescope?
How does Julian calendar determine which year are leap years?
every fourth year is a leap year
Gregorian calendar determine which years are leap year?
elimination of leap years for all century years except those evenly divisible by 400