Timekeeping and Calendars


Radio Programs

Big Dipper Clock Ticking off the hours of the night Friday, January 22, 2016
The Pleiades A “stellar” weather forecast Monday, November 9, 2015
September Equinox Changing seasons — one way or another Tuesday, September 22, 2015
Moon and Antares Ticking off the hours of the night Saturday, September 19, 2015
Lammas Splitting the difference on the calendar Saturday, August 1, 2015
Leap Second Stretching out the month of June Tuesday, June 30, 2015
Canopus III Navigating by a bright star Tuesday, February 24, 2015
Moon and Mars Jet lag after a long trip Tuesday, November 25, 2014
Daylight Saving Time Saving daylight to save energy Saturday, November 1, 2014
Star Time Setting your watch by the stars Tuesday, October 21, 2014
Autumnal Equinox One way to mark a change in seasons Monday, September 22, 2014
July Honoring a famous calendar maker Monday, July 1, 2013
Winter Solstice A changing calendar cycle Friday, December 21, 2012
Moon and Companions Nothing to fear in the morning sky Saturday, December 8, 2012
Seventh Month Miscounting the months Saturday, September 1, 2012
Relativity and GPS Keeping track of the entire world Tuesday, May 8, 2012
Leap Day Leaping into the modern calendar Wednesday, February 29, 2012
The New Year Bringing the calendar to heel Sunday, January 1, 2012
Saturnalia A modern celebration with old customs Saturday, December 17, 2011
Daylight Saving Time Stepping back in time Sunday, November 6, 2011
Changing Time Just passing the time Tuesday, October 18, 2011
Calendars Following the cycles of the sky Friday, September 23, 2011
Moon and Jupiter An ancient god and the modern calendar Thursday, September 15, 2011
April Springing into a beautiful month Friday, April 1, 2011
Moon and Saturn A timely companion for the Moon Saturday, March 19, 2011
February Counting up the days of February Tuesday, February 1, 2011

Featured Images

Postcard of the historic Elgin Watch Company Observatory in Illinois
Star Time Saturday, October 25, 2014
Without Einstein's theories of relativity, GPS wouldn't work
Where Am I? Tuesday, May 8, 2012


©2015 The University of Texas McDonald Observatory