The Motion of the Sun

The Motion of the Sun

• http://www.astronomy.com/news/2014/01/black-hole-powers-cosmic-flashlight-illuminating-the-cosmic-web

Draw the Earth’s Revolution

• Day/night length• Equinox and solstice• Seasons

Highest and Lowest Declination

Annual Motion of the Sun

The Declination of the Sun…varies between –23º and +23º

Where is the sun…

• During the Equinox?• During the Summer solstice?• During the Winter solstice?

Life at the Poles

• North Pole- 6 months of daylight beginning at the spring (vernal) equinox and ending at the autumnal equinox– The other 6 months of the year it is night

• South Pole- 6 months of daylight beginning at the autumnal equinox and ending in the vernal equinox– The other 6 months of the year it is night

What shape is the Earths Revolution around the sun?

Misconception

• Earth’s seasons are caused by moving closer and further from the sun…false

Earth’s Distance from the Sun

• Perihelion (closest to the Sun) is around January 3 when Earth is about 91,405,436 miles from the Sun.

• Aphelion (farthest from the Sun) is around July 4 when Earth is about 94,511,989 miles from the Sun.

Weather

• Weather in the southern hemisphere is more constant than the northern. Reason?

Drawing the Suns Path

• Recap– Draw our bubble with the equator, zenith, and

celestial north pole– Where will the sun be located on the two solstices

and the two equinox