We show daylight length in San Juan during 2018 and the dates of equinoxes and solstices. From June 1, 2018 until June 21, 2018 daylight becomes longer. From June 22, 2018 until December 21, 2018 daylight becomes shorter. From December 22, 2018 until May 31, 2019 daylight becomes longer.
We show the equation of time during 2018. 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 Thursday, September 13 2018.
The day with the highest positive value is Tuesday, June 5 2018.
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 2018.