# How Many Days Are in a Year?

Background: The true length of a year on Earth is 365.2422 days, or about 365.25 days. We keep our calendar in sync with the seasons by having most years 365 days long but making just under 1/4 of all years 366-day "leap" years. Exercise: Design a reasonable calendar for an imaginary planet. Your calendar will consist of a pattern of 366-day "leap" years and 365-day regular years that approximates your planet's average number of days per year.

Evan M. Manning

Date Accepted:
1997-09-05
Grade Group:
High School (9-12)
Benchmarks:
M3.4.2
S17.4.1
S17.4.2
S17.4.3
Keywords:
leap year
year
calendar
error analysis
fractions
Microsoft Word:
04_21_97_1.docx
PDF Document:
04_21_97_1.pdf