Peculiar jump in Venus's position

[JamesC]

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.uk/fil ... lem.tar.gz

So all it is, is this:

"Go to madrid, 20th Feb, about 21h.
Set view with horizontal grid
Jump forwards in 24h steps"

Either I'm doing something stupid, which is most probable, or there is something wrong with the orbits, which I doubt.

Cheers, James

[selden]

I don't see any such effect on my computer(s).

What Addons do you have installed?

What you see is consistent with the Earth's Rotation being Modified by one or more Addons, and one of them having a Beginning or Ending statement in its SSC.

[JamesC]

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 thought. Daylight saving.

Just as well I didn't waste bug-report space.


Here, for completeness, are my addons:

- High res. textures for planets, and for the sun (all optional - Not selected in this case)
- Two or three cities on earth
- Some nebulae (also switched off in prefs.)
- Something called "starest.stc" the only element in "~/CelestiaResources/extras/addons"

And I'm on OS X 10.6.8, with celestia up to date on 1.6.1.

So there's me looking foolish, but as foolish as might have been ! Cheers - James

[selden]

James,

Thanks for the update! I didn't think of DST either. Ours starts on March 11. I normally run Celestia with the clock set for Universal Time, so I wouldn't have noticed a DST change.

[JamesC]

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 different. Fascinating.