Science U2 Leap Year

What is a solar year? 

• The time it takes the Earth to make one revolution around the sun. 
• The time it takes the Earth to make a full rotation on its axis. 
• The time it takes the Sun to make one revolution around the Earth.
• The time it takes the moon to  make one revolution around the Earth. 

One solar year last _____________ 356 days. 

• less than
• approximately 
• exactly
• 12 hours longer than

Leap day is a quadrennial occurrence. What does "quadrennial" mean? (Hint: think of the prefix)

• Occurring exactly once a year
• Occurring infrequently
• Occurring exactly every 4 years
• Occurring exactly once per century 

Which of the following years was a leap year?

• 1978
• 1982
• 1984
• 1990

How do the traditional Chinese and Hebrew calendars differ from the Gregorian calendar?

• Their months are based on the cycles of the moon. 
• Their years are usually longer than Gregorian calendar years
• They have a leap year every two years instead of every four years
• Their years are all exactly 365 days long. 

If you were born on Leap Day, 1980, how many birthdays would you have celebrated by 2010 (assuming you only celebrate your birthday on Leap Day)?

• 30 birthdays
• 15 birthdays
• 6 birthdays
• 7 birthdays