Resource List: Calendars
- Sundials
- World Time Zones and Time Zone Map
- Seasons for the Northern Hemisphere, 2017
- Seasons for the Northern Hemisphere, 2016
- Seasons for the Northern Hemisphere, 2015
- Seasons for the Northern Hemisphere, 2014
- Seasons for the Northern Hemisphere, 2013
- Seasons for the Northern Hemisphere, 2012
- Seasons for the Northern Hemisphere, 2011
- Seasons for the Northern Hemisphere, 2010
- Seasons for the Northern Hemisphere, 2009
- Seasons for the Northern Hemisphere, 2008
- History of the Roman (Julian) Calendar
- History of the Lunar Calendar
- Adoption of the Gregorian Calendar
- History of the Egyptian Calendar
- The End of the World as We Know It?