Out of Time: Time Measurement Oddities You May Not Know About
Last month’s Winter Solstice was the shortest day of the year, with 9 hours, 15 minutes and 16 seconds of daylight. The sun, however, did not set at the earliest time it would set during the year since that event took place earlier in the month. In fact, the earliest sunset in 2014 was at 4:28 pm (December 7, 8, and 9) while sunset on the Solstice was at 4:32 pm. A similar thing will happen in June of 2015, when the longest day of the year will have one of the latest sunsets (8:31 pm) but not one of the earliest sunrises (that would be June 11-18 at 5:24 am). The reason has to do with a concept called the equation of time, which is explained in detail on the website Time and Date. In a nutshell, the sun and earth are not perfect balls travelling in perfect circles so our traditional measures of time on a 24-hour clock do not equate to a nice, precise time for the Solstices to occur. For this reason, they occur on different dates and times each year and thus changes in the sea...