Posts by JamesC

by JamesC
01.03.2017, 21:40
Forum: Development
Topic: Celestia 1.7.0 Development will begin soon
Replies: 87
Views: 18035

Re: Celestia 1.7.0 Development will begin soon

I'm a bit late, because I've only just learned about the movements over the last few months. I pointed out Celestia to a coleague of mine, saying "it's great, but hasn't changed for years. Chris Laurel told me it was dormant". This colleague went and had a look, and came back very enthusia...
by JamesC
27.02.2012, 18:46
Forum: Celestia Users
Topic: Peculiar jump in Venus's position
Replies: 4
Views: 1987

Re: Peculiar jump in Venus's position

Ah, well there's the thing - I run celestia with local time because I use it frequently to keep track of interesting things to look at, here by the sea. In particular, Mercury early next Sunday evening, if I remember right. And I had no idea summer time changed so much - It's nearly two weeks differ...
by JamesC
27.02.2012, 18:14
Forum: Celestia Users
Topic: Peculiar jump in Venus's position
Replies: 4
Views: 1987

Re: Peculiar jump in Venus's position

Hi Selden, I've got it - it's the daylight saving ! I went to the 25th, marked where Venus was. Then forward to the 25th, where the position jumps. Then finely adjusted the time until Venus was nearly where it had been at 9pm, the day before - and it was an hour later. "One hour ??? " I th...
by JamesC
27.02.2012, 10:22
Forum: Celestia Users
Topic: Peculiar jump in Venus's position
Replies: 4
Views: 1987

Peculiar jump in Venus's position

I don't dare post this as a bug, I think I'm doing something wrong: However, I was looking at the position of the planets over the next few days at dusk, and find a strange jump in the position of all of them, on the 25th Feb. I've posted screeenshots and a readme at https://fileexchange.imperial.ac...
by JamesC
19.09.2009, 10:51
Forum: Physics and Astronomy
Topic: Global Warming
Replies: 15
Views: 4329

Re: Global Warming

BobHedgewood: This is not news - it's perfectly understood that within the warming trend, there is variation. It's being talked about as if it was a hot topic because of comments on the subject by Latif of Kiel Uni. at the world climate conference. There have been many others: For example, the bigge...
by JamesC
19.09.2009, 09:52
Forum: Physics and Astronomy
Topic: Universe expansion
Replies: 2
Views: 1827

Re: Universe expansion

A rambling and naive set of questions about universe expansion folks: - The big bang: This creates 3D space and time - and occurred in nothing. Therefore: Is it correct to say that the big bang occurred at every point in our current space - time? Nope, because into "nothing" cannot be som...
by JamesC
13.09.2009, 14:33
Forum: Physics and Astronomy
Topic: Universe expansion
Replies: 2
Views: 1827

Universe expansion

A rambling and naive set of questions about universe expansion folks: - The big bang: This creates 3D space and time - and occurred in nothing. Therefore: Is it correct to say that the big bang occurred at every point in our current space - time? - The cosmic microwave background: Similarly, this is...
by JamesC
13.09.2009, 13:19
Forum: Physics and Astronomy
Topic: Fake Moon rock
Replies: 11
Views: 3151

Re: Fake Moon rock

My first reaction to this story was " Who cares? It's the gesture, not the fact that it's actually a piece of wood." and forgive me if I sound flippant. But if some moon-person gave me a piece of moon rock, I't stick it on the mantle-piece and wouldn't bother checking it: The story is far...
by JamesC
13.09.2009, 12:41
Forum: Physics and Astronomy
Topic: Black Holes: Overweight Neutron Stars?
Replies: 11
Views: 3643

Re: Black Holes: Overweight Neutron Stars?

Hungry4info: Well, I'm casting my mind back to what we learnt years ago in particle physics and I've forgotten most of it. Anyway: What I do remember is: - In a nuclear fission or fusion reaction (using the term loosely because e- + p+ => no isn't fusion) ... mass is not conserved. Mass can be conve...
by JamesC
12.09.2009, 14:21
Forum: Physics and Astronomy
Topic: Black Holes: Overweight Neutron Stars?
Replies: 11
Views: 3643

Re: Black Holes: Overweight Neutron Stars?

PlutonianEmpire : Neutron stars have size and are made of regular matter albeit only neutrons. Black holes have no size : They are points. They have NO identifiable constituent matter (which has size). In the neutron star , you have regular material organised in three dimensions - except that it's ...
by JamesC
11.07.2009, 14:40
Forum: Celestia Users
Topic: Celestia 1.6.0 released
Replies: 41
Views: 13751

Re: Celestia 1.6.0 released

Thanks Chris and all, it's great!

The grids are most useful, triaxial epplipsoids - I'd never have thought to see that, and the planetshine is impressive.

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