Durk Talsma wrote: > On Monday 16 October 2006 22:39, Donn Washburn wrote: >> I just checked it against my memory and I found it to be 1 hour off. >> It was 2PM local and if I hit the "Clock Time" button shows fgfs = >> "local 13:28") it is currently 15:29 , hit Noon and it shows 12:59 >> Afternoon shows 15:42 (would be wrong)and Dusk shows 18:32 (would be >> correct) finally hit Evening and it shows 19:26 (real time ##:34) >> Turns out Afternoon and Evening display the wrong minutes. Sorry about >> the possible errors in my quoting time. A fast run down shows that all >> of the times do not hold the minutes correctly. The light/dark does >> work correctly. Current System time is 15:38 fgfs show Afternoon as 15:42. >> > > Hi Donn, > > Just a few questions / thoughts: Which operating system are you running? The > reason I'm asking is that I am aware of the fact that there might be a > problem with the way the windows version of flightgear handles daylight > saving time. I always found that windows time was one hour off when using the > --time-match=[real|local|system] commandline options. This may explain the > one hour difference between real and simulated time you're observing. On my > linux system this has always worked correctly. > > Secondly, going through the time code recently, I noticed that the sunset / > sunrise / noon times are calculated by calculating the exact solar time at > the current user position. Although physically correct, we humans have > decided that this type of time is quite useless in real life, and devided the > planet into a more managable 24 time-zone system. Although this suits us, the > consequence is that the difference between true solar time and local timezone > time can be fairly high. I don't think that FlightGear currently takes the > difference between solar time and human time zone information into account > when it comes to noon/dawn/dusk calculations, but I could be wrong here. > > Hope this helps, > Durk >
Donn seems busy today, he runs SuSE Linux 10.1. I have not paid any attention to exact times, I just use --timeofday= to get daylight if it's night where I am. Regards Sid. -- Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support Specialist, Cricket Coach Microsoft Windows Free Zone - Linux used for all Computing Tasks ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Flightgear-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-users
