Happy Holidays!
What is winter solstice and when does it occur?
The winter solstice, the shortest day of the year, occurs on Dec. 22, 2015 in the Northern Hemisphere. This occurs as a result of the Earth’s axis of rotation being tilted in relation to its orbit around the sun.
Learn More
snow mountainsnow man
header
Sign Up
Teacher Sign Up
Are you a student? Sign up here
Sign up with Google Sign up with Facebook Twitter Microsoft
Show More
or
Sign up using email
Sign Up
Teacher Sign Up
Full Name
 
Email
 
Password
 
Show password
Already have an account?Sign in
By signing up, I confirm that I have read and agree to the Terms of use and Privacy Policy.
ABOUT
  • Our Mission
  • Meet the Team
  • Partners
  • Press
  • Careers
  • Security
  • Status
  • Success Stories
  • Blog
  • Overview
  • CK-12 Usage Map
  • Testimonials
SUPPORT
  • Certified Educator Program
  • Webinars
  • CK-12 Resources
  • Pilot Program
  • Help
  • Contact Us
By CK-12
  • Common Core Math
  • K-12 FlexBooks®
  • College FlexBooks®
  • Tools and Apps
  • BRAINGENIE™
v.20210917031815 | © CK-12 Foundation
FlexBook® Platform
Terms of Use | Privacy | Attribution Guide | CK12 License
v.20210917031815 | © CK-12 Foundation
FlexBook® Platform
+

CK-12 Overview