Thanks, Jim, Kurt, Chuck and others who responded. I've got all I needed - thanks again. ----- Original Message ----- From: "James Cobb" <james@cobb.name> To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Sent: Friday, August 12, 2005 8:57 AM Subject: [Utah-astronomy] Re: solstices | 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 | | | | _______________________________________________ | Utah-Astronomy mailing list | Utah-Astronomy@mailman.xmission.com | http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy | Visit the Photo Gallery: http://www.utahastronomy.com | | ______________________________________________________________________ | This e-mail has been scanned by Cut.Net Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on Cut.Nets Content Service, visit http://www.cut.net | ______________________________________________________________________ | |