Celestial Sphere
What is right ascension?
The direction that we look to find a star or constellation.
Who was the first recorded astronomer?
Aristarchus
This season starts when the sun rises at exactly 0 degrees, 0 hours.
Spring
The time it takes for the earth to orbit the sun one time.
1revolution
How can you locate Polaris?
Find the star in the bucket of the Big Dipper where the water would poor out and trace a straight line up to the last star in the handle of the Little Dipper.
What is declination?
How high to look from the horizon to locate a star or constellation.
This model stated that the earth was the center of the universe.
Geocentric model
How does the earth's tilt contribute to the seasons?
When the earth is tilting towards the sun, temperatures rise. When the earth is tilting away from the sun, temperatures fall.
This is how astronomers account for the extra .25 days of the year.
Leap year/Extra day in February
At what angle is the earth tilted?
23.5 degrees
Describe what the celestial sphere is.
The imaginary sphere around the earth that seems to hold all of the planets and stars.
This astronomer's ideas were widely believed for 1,400 years.
Ptolemy
Are the seasons the same for the whole planet? Explain your answer.
No, because of the revolution of the earth around the sun the hemispheres experience "opposite" seasons.
What is the time difference between the Julian and the Gregorian calendars?
.0002%/10.6 minutes
When was New Year's day in the Julian calendar?
March 25
What is the vernal equinox?
Exactly east, where the sun rises on March 21.
How did prehistoric people use astronomy?
To hunt, gather, track game, direction, and seasons
Which season is it when the sun's rays hit the south pole?
Winter
Describe what stellar parallax is.
The way we measure the distance to stars by the shift of a star when viewed from two different angles
What day is the autumnal equinox on?
September 21
What is the right ascension and declination of the celestial south pole?
90 degrees, 6hours
This astronomical model is the correct model for how this solar system works.
Heliocentric model
Which season is it when the sun's rays hit the equator?
Spring and autumn
The time it takes for the earth to spin on its axis once
1 rotation
How many planets are in our solar system?
8