Changing Rate of Change of Daylight
Date: April 2011
Why does the amount of time the day length increases or decreases by throughout the year change from day to day? For example, the length of the day in Indiana increased by 2 minutes 1 second from January 25 to January 26 and then increased by 2 minutes 40 seconds from February 25 to February 26.
The changing rate of increase or decrease in the length of sunshine
has to do with how fast the Sun is moving north (before summer) or
south (after summer). In spring and fall this change would be the fastest.
David H. Levy
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Update: June 2012