1. Lesson Essential Question:
BELLRINGER:
Use your textbook to define the word astronomy.
Lesson Essential Question:
How does Earth’s movement impact our daily lives? 1

2. Today's Activities: Go over bellringer Vocab Previewing
Rotation vs. Revolution Vocabulary Discussion
Rotation vs. Revolution Simon Says Activity
Calendar discussion and notes 2

3. WORD SPLASH revolution orbit astronomy calendar rotation Leap year
axis 3

4. The spinning motion of a planet on its axis

5. The movement of one object around another.

6. Orbit – the PATH of one object as it revolves around another object.

7. Rotation vs. Revolution
SIMON SAYS!!!
Stand beside your partner
Listen for Rotation, Revolution, or Both to be called!!
Rotation – Both partners spin in place.
Revolution – Earth partner circles around sun partner.
Both – Earth partner spins and circle sun partner.

8. What is the calendar?
The calendar is a system of organizing time that defines the beginning, length, and divisions of a year.

9. No one knows who invented the first calendar.
No one knows when the first calendar was invented.
Notched bones recording moon phases have been found in Africa and Europe.
They are from 20,500 B. C. WOW, that’s old!

10. There are over 30 different calendars used in the world today!

11. Our calendar started with the ancient Egyptians.
The Egyptians based their calendar on the sun because of their belief in the sun god Ra.

12. Julius Cesar - famous Roman Emperor wanted a new calendar.
Picked the Egyptian calendar and changed it a little bit.
Julius Caesar expanded the Roman empire until it covered parts of Africa, Asia and Europe.
As the empire grew, the calendar went with it. That is why European countries use this calendar.

13. That’s why we use Julius Caesar’s calendar!
The USA was settled by European colonists who brought the calendar with them.
That’s why we use Julius Caesar’s calendar!

14. The Julian Calendar Julian Calendar (adopted by Julius Caesar)
Year = days long
Normal year = 365 days
Every 4 years there was one extra day in the year. ( )
Add leap day (Feb 29) every 4 years

15. The Catholic Pope Gregory XIII (the thirteenth) changed the calendar again in 1582.
Julius Caesar had counted wrong and the leap years needed to be changed or Easter would be in the middle of the summer!

16. The Gregorian Calendar
Gregorian Calendar (adopted by Pope Gregory)
10 day error accumulated by 1582
October 4, 1582 followed by October 15, 1582
10 days eliminated from calendar

17. The Gregorian Calendar
Modified leap day rules
Year = days long
Normal year = 365 days
Add leap day (Feb 29) every 4 years
Remove one leap day every hundred years
Except every 400 years (so 2000 was a leap year!)

18. Julius Caesar named the months of the year.
January- the Roman god Janus
February- the Roman purification festival Februa
March- the Roman god Mars
April- the old Roman calendar month of Aprilis
May- the Roman goddess Maia
June- the Roman goddess Juno
July- named after Julius Caesar
August- named for the Roman emperor Augustus
September- from the Latin septem which means seven
October- from the Latin octo or eight
November- from the Latin nove or nine
December- from the Latin decem or ten

19. That’s really strange, isn’t it?
So why does the ninth month mean seven, the tenth month mean eight, the eleventh month mean nine and the twelfth month mean ten?
Julius Caesar’s calendar started with the month of March and ended with the month of February.
That’s really strange, isn’t it?

20. Sunday
the sun’s day

21. Monday
the moon’s day

22. Mars was the Roman god of war Twi was the old English god of war
Tuesday
English for Mars’ day
Twi’s day
Mars was the Roman god of war
Twi was the old English god of war

23. Wednesday English for Mercury’s day Wotan’s day
Mercury was the Roman god of peace and prosperity
Wotan was the old English god of peace and prosperity

24. Thursday English for Jupiter’s day Thor’s day
Jupiter was the king of the Roman gods
Thor was the old English thunder god

25. Friday English for Venus’ day Frigg’s day
Venus was the Roman goddess of love
Frigg was the old English goddess of love

26. Saturn was the Roman god of planting and harvest
Saturday
Saturn’s day
Saturn was the Roman god of planting and harvest

27. Leap Year
Adding one day every 4 years (Feb 29) since the year is actually days long.

28. Bring in your Weather and Climate textbook.
Homework:
Sunday, April 23, 2017
Bring in your Weather and Climate textbook. 28

29. Crossword Closure Slip
Complete the Crossword Puzzle
If you need help, look in your notes from today! 29