We show daylight length in San Juan during 2017 and the dates of equinoxes and solstices. From June 1, 2017 until June 20, 2017 daylight becomes longer. From June 21, 2017 until December 21, 2017 daylight becomes shorter. From December 22, 2017 until May 31, 2018 daylight becomes longer.
We show the equation of time during 2017. In the graph, the day of the year in the x axis starting from January, and the difference between mean solar time and apparent solar time in the y axis.
The day with the highest negative value is Wednesday, September 13 2017.
The day with the highest positive value is Sunday, June 4 2017.
Apparent solar time and mean solar time are of the same length on the following days of the year:
Time of sunrise, sunset, dawn and dusk in San Juan during 2017.