2009 Summer Solstice
June 21 at 1:45 a.m., eastern daylight time.
   (June 21, 05:45 UT*.)

2009 Autumnal Equinox
September 22 at 5:18 p.m., eastern daylight time.
   (September 22, 21:18 UT*.)

2009 Winter Solstice
December 21 at 12:47 p.m., eastern standard time.
   (December 21, 17:47 UT*.)

2010 Spring (Vernal) Equinox
March 20 at 1:32 p.m., eastern daylight time.
   (March 20, 17:32 UT*.)

2010 Summer Solstice
June 21 at 7:28 a.m., eastern daylight time.
   (June 21, 11:28 UT*.)

* UT = Universal Time (Greenwich Mean Time)

Read an excerpt from Machaelle's Perelandra Garden Workbook (Chapter 15, pages 181-188)
that explains The Solstice and Equinox Cycle.