Kim, Using xephem I have the following for Salt Lake City. Sunrise and sunset are defined by the solar limb, and atmospheric distortion is taken into account. I used xephem's solver to compute solstice as the instant when the earth's heliocentric latitude is 90 or 270. I stepped through sunrises and sunsets near the two solstices to find the extremal rise/ set times (using the solver to view a decimal hour with better precision than is reported here in hour and minutes). The small tables below will look best in a mono-spaced font. Reported are declination, altitude, heliocentric longitude, rise time, transit time, and set time. Summer times are reported as daylight savings time. Let me know if there is further info you want. Regards, Jim _______________________________________ Site: Salt Lake City, Utah Lat: 40:45:23 Long: 111:53:26 Elev: 1338.1m Temp: 10C Pres: 1010mB June 2005: Solstice: Dec Alt HeLong RisTm TrnTm SetTm Sun 23:26:10.6 -24:35:05 270:00:00 5:56 13:30 21:03 Limb Equ: Topo 2000.0 6/21/2005 0:35:11 MDT Earliest sunrise: Dec Alt HeLong RisTm TrnTm SetTm Sun 23:16:30.5 -0:14:58 263:31:51 5:55 13:28 21:01 Limb Equ: Topo 2000.0 6/14/2005 5:55:19 MDT Latest sunset: Dec Alt HeLong RisTm TrnTm SetTm Sun 23:16:45.4 -0:15:34 276:32:04 5:58 13:31 21:03 Limb Equ: Topo 2000.0 6/27/2005 21:03:19 MDT December 2005: Solstice: Dec Alt HeLong RisTm TrnTm SetTm Sun -23:26:26.3 24:19:35 90:00:00 7:48 12:26 17:04 Limb Equ: Topo 2000.0 12/21/2005 11:25:36 MST Latest sunrise: Dec Alt HeLong RisTm TrnTm SetTm Sun -22:42:03.6 -0:16:17 104:07:03 7:52 12:33 17:14 Limb Equ: Topo 2000.0 1/04/2006 7:51:33 MST Earliest sunset: Dec Alt HeLong RisTm TrnTm SetTm Sun -22:41:44.9 -0:16:12 75:59:58 7:38 12:19 17:00 Limb Equ: Topo 2000.0 12/07/2005 17:00:16 MST