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

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

WORD SPLASH revolution orbit astronomy calendar rotation Leap year axis 3

The spinning motion of a planet on its axis

The movement of one object around another. https://www.youtube.com/watch?v=kg0nS2n_lCY

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

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.

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

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!

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

Our calendar started with the ancient Egyptians. The Egyptians based their calendar on the sun because of their belief in the sun god Ra. https://www.youtube.com/watch?v=kzprsR2SvrQ

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.

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!

The Julian Calendar Julian Calendar (adopted by Julius Caesar) Year = 365.25 days long Normal year = 365 days Every 4 years there was one extra day in the year. (.25 + .25 + .25 + .25) Add leap day (Feb 29) every 4 years

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!

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

The Gregorian Calendar Modified leap day rules Year = 365.2425 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!)

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

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?

Sunday the sun’s day

Monday the moon’s day

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

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

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

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

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

Leap Year Adding one day every 4 years (Feb 29) since the year is actually 365.25 days long.

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

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