Rotation
What are 2 results of Rotation?
Day or Night
What is the average distance of the Earth from the Sun?
150 million kilometers (93.75 million miles)
What kind of toy does axial precession look like?
Spinning top
Mean Solar Day
The time interval from one noon to the next, which averages about 24 hours
Roughly, how many miles per hour does the Earth spin?
1000 mph
How fast does the Sun move around the Earth in an elliptical orbit?
66,000 miles per hour (107,000 kilometers)
What is axial precession?
Gradual change in the orientation of the Earth’s axis over a period of 26,000 years.
Sidereal Day
Measured by the time required for a star to reappear at the identical position in the sky.
What are the two measurements of Rotation?
Sidereal day and Mean Solar Day
23.5 degrees
Does precession have an affect on the season?
Yes but very minor.
Aphelion
Each year, on July 4th the Earth is 152 kilometers (94.5 million miles) away.
When using mean solar day measurement, the time interval starts and ends at what time in the day?
Noon to noon
As a result of Earth’s orbital movement the Sun appears to be displaced among the constellations at equal distance to about twice its width, or ___(s) degree each day.
1 degree.
By the year 28,000 what star will be the North star?
Polaris
Plane of the Ecliptic
The imaginary plane that connects points along the ecliptic.
Who uses the sidereal day measurement?
Observatories
During the perihelion how far is the Earth from the sun? (In miles) HINT: PERI=NEAR
91.5 million miles
What is the closest galaxy to us?
Andromeda
Ecliptic
The apparent annual path of the Sun against the backdrop of the celestial sphere is called the ecliptic.