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 galaxy 
• The time it takes the moon to make one revolution around the Earth 

One solar year lasts _______ 365 days 

• Less than 
• Approximately 
• Exactly
  
• 12 hours longer than 

Leap day is a quadrennial occurrence. What does "quadrennial" mean? 

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

What can you infer about the Roman calendar before Julius Caesar reformed it?

• It was not divided into months and weeks 
• It was used mainly by farmers
  
• It was extremely flawed
  
• It was based on the phases of the moon 

Today, the winter solstice occurs on December 21. When did it fall in the years immediately before the Gregorian calendar was adopted?

• In late November 
• In late January
  
• In early February 
• In early November 

Which of the following years was a leap year?

• 1978 

• 1982 

• 1984 

• 1990 

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

• 30 
• 15 
• 6 
• 7 

Why did 1752 only have 354 days in the U.S. and Britain? 

• It marked the switch from the Julian to the Gregorian calendar 
• The two countries were experimenting with a lunar calendar that year 
• The solar year was shorter than normal that year 
• It was a leap year 

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