Posts by jeffmack

by jeffmack
21.03.2011, 18:01
Forum: Physics and Astronomy
Topic: Black hole theory
Replies: 20
Views: 6606

Re: Black hole theory

Yes, Hungry4info pretty much said it. When I said that a person crossing the event horizon wouldn't notice anything unusual, it was, of course, under the assumption that he hadn't already been torn apart by tidal forces, or killed by intense radiation, etc. The event horizon has more relevance to an...
by jeffmack
20.03.2011, 22:57
Forum: Physics and Astronomy
Topic: Black hole theory
Replies: 20
Views: 6606

Re: Black hole theory

The event horizon is not made of matter. It is only a boundary, and locally everything behaves normally there. A person passing through it would notice nothing unusual.
by jeffmack
21.02.2011, 03:53
Forum: Physics and Astronomy
Topic: "It's About Time" (AstroClock JavaScript Program)
Replies: 4
Views: 2425

Re: "It's About Time" (AstroClock JavaScript Program)

As promised, I have upgraded my real-time JavaScript program, AstroClock, to utilize the more accurate 488-term NU2000K nutation model!

http://www.jeffmack.net/astroclk.html
by jeffmack
13.02.2011, 19:52
Forum: Help Central
Topic: Problems running on ATI Mobility Radeon HD 4670 graphics
Replies: 36
Views: 10910

Re: Problems running on ATI Mobility Radeon HD 4670 graphics

Good to know. Who'd have "thunk" it? :)

I'm going to download and install SpeedFan soon.
by jeffmack
13.02.2011, 16:34
Forum: Bugs
Topic: Strange Behavior of Sol when Pluto's Hydra is On-Screen
Replies: 19
Views: 7191

Re: Strange Behavior of Sol when Pluto's Hydra is On-Screen

Selden,

Do I need to report this bug elsewhere (i.e. SourceForge)? Or can I consider it already officially reported?

Thanks! :)
by jeffmack
13.02.2011, 13:38
Forum: Help Central
Topic: Problems running on ATI Mobility Radeon HD 4670 graphics
Replies: 36
Views: 10910

Re: Problems running on ATI Mobility Radeon HD 4670 graphics

Thanks again for all your help, Selden. :)

I'll continue keeping my graphics drivers up-to-date as well.
by jeffmack
13.02.2011, 03:07
Forum: Help Central
Topic: Problems running on ATI Mobility Radeon HD 4670 graphics
Replies: 36
Views: 10910

Re: Problems running on ATI Mobility Radeon HD 4670 graphics

Thank you Selden and Fenerit for your helpful suggestions. The laptop is a new one, and I've had the Celestia graphics problems from the beginning. It's located in a dust-free and smoke-free environment, with an ambient temperature of 65-68 degrees Farenheit. It also sits on a running external lapto...
by jeffmack
12.02.2011, 14:58
Forum: Bugs
Topic: Strange Behavior of Sol when Pluto's Hydra is On-Screen
Replies: 19
Views: 7191

Re: Strange Behavior of Sol when Pluto's Hydra is On-Screen

Yes, in my case, the blackouts flicker with Nix at the default "GoTo" distance - but persist with Hydra at the default "GoTo" distance.
by jeffmack
12.02.2011, 00:08
Forum: Bugs
Topic: Strange Behavior of Sol when Pluto's Hydra is On-Screen
Replies: 19
Views: 7191

Re: Strange Behavior of Sol when Pluto's Hydra is On-Screen

My conclusion is based on David ("DOJOMO")'s configuration.
by jeffmack
11.02.2011, 23:16
Forum: Help Central
Topic: Problems running on ATI Mobility Radeon HD 4670 graphics
Replies: 36
Views: 10910

Re: Problems running on ATI Mobility Radeon HD 4670 graphics

Well, it now appears that the updated graphics adapter driver did not solve all of my problems in Celestia. However, the most serious of them (the lock-ups of Celestia) does seem to have been fixed by the driver update. The two remaining problems (the occasional flashing streaks of light in the back...
by jeffmack
11.02.2011, 22:06
Forum: Bugs
Topic: Strange Behavior of Sol when Pluto's Hydra is On-Screen
Replies: 19
Views: 7191

Re: Strange Behavior of Sol when Pluto's Hydra is On-Screen

Ahhh, so now we have an example with an Nvidia graphics adapter - as well as a "non" Dell!

Thanks David! :)
by jeffmack
11.02.2011, 21:54
Forum: Bugs
Topic: Strange Behavior of Sol when Pluto's Hydra is On-Screen
Replies: 19
Views: 7191

Re: Strange Behavior of Sol when Pluto's Hydra is On-Screen

I see it on two Dells, correct - but everything else is different about the two systems (processor, mainboard, chipset, graphics card & graphics card manufacturer, version of Windows, etc.). I believe I also see a relationship with distance (or at least the apparent size of the moon on-screen - ...
by jeffmack
11.02.2011, 19:22
Forum: Bugs
Topic: Strange Behavior of Sol when Pluto's Hydra is On-Screen
Replies: 19
Views: 7191

Re: Strange Behavior of Sol when Pluto's Hydra is On-Screen

I'm not upset Selden. If I were, I wouldn't have included the smiley face. :)

Thanks fungun. Glad I'm not alone! :)

Thanks to the both of you!
by jeffmack
11.02.2011, 18:31
Forum: Bugs
Topic: Strange Behavior of Sol when Pluto's Hydra is On-Screen
Replies: 19
Views: 7191

Re: Strange Behavior of Sol when Pluto's Hydra is On-Screen

A) I installed the latest drivers on both systems within the last week . B) I downloaded the drivers from the graphics card manufacturers' Web sites for both systems (ATI/AMD and Intel respectively). C) I completely uninstalled the old drivers prior to installing the new ones (with intervening reboo...
by jeffmack
11.02.2011, 12:50
Forum: Bugs
Topic: Strange Behavior of Sol when Pluto's Hydra is On-Screen
Replies: 19
Views: 7191

Re: Strange Behavior of Sol when Pluto's Hydra is On-Screen

As noted in my original post, the latest graphics drivers are installed on both systems. I just experimented with your other questions and found that the behavior occurs with all three Star Styles (the attached screen capture was made with the Star Style of "Points"). It occurs for Nix as ...
by jeffmack
11.02.2011, 03:05
Forum: Bugs
Topic: Strange Behavior of Sol when Pluto's Hydra is On-Screen
Replies: 19
Views: 7191

Strange Behavior of Sol when Pluto's Hydra is On-Screen

I believe that the following may be a Celestia bug, as I can reliably reproduce it on two completely different platforms: I "GoTo" Pluto's Hydra, and then "Orbit" about Hydra (Right-Click/Drag) until I bring Sol into view. Then, when I shift the view about, either by changing the...
by jeffmack
01.02.2011, 23:15
Forum: Help Central
Topic: Problems running on ATI Mobility Radeon HD 4670 graphics
Replies: 36
Views: 10910

Re: Problems running on ATI Mobility Radeon HD 4670 graphics

ATI/AMD just released a new update of my graphics adapter driver - just one month after their previous update! Although it's still too soon to be sure, it's quite possible that they have resolved the problems that I was experiencing while running Celestia. :D After installing the new update, I turne...

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