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Patch 0.9.8.0e

Posted: 21 Nov 2017 13:49
by SpaceEngineer
It is not, in a valid time frame of the orbital solution model (years 1550 to 2650).

Patch 0.9.8.0e

Posted: 21 Nov 2017 23:34
by Mouthwash
SpaceEngineer wrote:
It is not, in a valid time frame of the orbital solution model (years 1550 to 2650).

I don't see any change whatsoever in Mercury's orbit even if I run max speed. Which is strange, because before the ephemerides patch, the perihelion and aphelion rotated around the sun at regular intervals. Which is the accurate one?

Patch 0.9.8.0e

Posted: 22 Nov 2017 00:03
by SpaceEngineer
Look more carefully. Rotation rate is just 9,5 arcminutes per century, ie on a valid time span of the DE436 model (1000 years) it rotates for just 1,5°

Patch 0.9.8.0e

Posted: 22 Nov 2017 01:32
by Mouthwash
SpaceEngineer wrote:
Look more carefully. Rotation rate is just 9,5 arcminutes per century, ie on a valid time span of the DE436 model (1000 years) it rotates for just 1,5°

I don't understand what you're saying. It's two million CE and the orbit hasn't visibly budged at all. I remember that at max speed (prepatch) it made a full rotation almost every second.

Patch 0.9.8.0e

Posted: 22 Nov 2017 03:21
by HarbingerDawn
Mouthwash wrote:
Source of the post I don't understand what you're saying. It's two million CE and the orbit hasn't visibly budged at all. I remember that at max speed (prepatch) it made a full rotation almost every second.

The DE436 ephemeris has a valid time span of 1100 years total (1550-2650). Outside of that span, you will not see the effects you're looking for.

Patch 0.9.8.0e

Posted: 22 Nov 2017 03:31
by FastFourierTransform
Mouthwash, we have talked about this in this thread long before (and also in the Work in progress thread):


FastFourierTransform:Source of the post I've just saw the precession of Mercury's perihelion. It's beautifull. But the problem is that it uses the DE436 theory that goes from the year 1550 to the year 2560. After that it imediatelly stops. If VSOP87 is also implemented and has unlimited timespan, why we can't see further evolution of Mercury's orbit?


FastFourierTransform:Source of the post Precession of Mercury's perihelion: I saw it in SE and looks great, but only occurs from the year 1550 to the 2560. Considering this is a more or less periodic phenomena could you make the timespan for the precession bigger? In that way we could see further evolution of Mercury's orbit. It's a very small angle now and If one has to explain it to people they are not going to clearly see it if it is not with longer duration.


SpaceEngineer:Source of the post JPL ephemeris does not calculate that value directly, so it cannot be extrapolated above the end points of the simulation.

Patch 0.9.8.0e

Posted: 22 Nov 2017 08:37
by Mouthwash
FastFourierTransform wrote:
Mouthwash, we have talked about this in this thread long before (and also in the Work in progress thread):


FastFourierTransform:Source of the post I've just saw the precession of Mercury's perihelion. It's beautifull. But the problem is that it uses the DE436 theory that goes from the year 1550 to the year 2560. After that it imediatelly stops. If VSOP87 is also implemented and has unlimited timespan, why we can't see further evolution of Mercury's orbit?


FastFourierTransform:Source of the post Precession of Mercury's perihelion: I saw it in SE and looks great, but only occurs from the year 1550 to the 2560. Considering this is a more or less periodic phenomena could you make the timespan for the precession bigger? In that way we could see further evolution of Mercury's orbit. It's a very small angle now and If one has to explain it to people they are not going to clearly see it if it is not with longer duration.


SpaceEngineer:Source of the post JPL ephemeris does not calculate that value directly, so it cannot be extrapolated above the end points of the simulation.


Ohhh, so it only shows the change for the period of time it's been recorded. What I saw before must have been a bug, because I definitely saw full rotations (it only showed at the two or three fastest speeds).

Patch 0.9.8.0e

Posted: 22 Nov 2017 12:39
by longname
Black hole shaders broken

Patch 0.9.8.0e

Posted: 26 Nov 2017 23:27
by SpacePioneer
longname wrote:
Black hole shaders broken

Nah, it's just your computer screen cracking from the stress of being so near a black hole.
(joke, please have mercy on me)

Patch 0.9.8.0e

Posted: 05 Dec 2017 15:36
by Mouthwash
Oh, the black square around your monitor? I'm getting that too.

Patch 0.9.8.0e

Posted: 06 Dec 2017 03:57
by SpaceEngineer
The fix for wrong Saturn rotation period (4h) is easy:

- extract SolarSys.sc from <SE folder>/data/catalogs/Catalogs0980.pak: it must be copied to this path:
<SE folder>/data/catalogs/planets/SolarSys.sc
- open it with notepad, find Saturn script, find RotationModel "IAU", and replace this line
RotationRate 1810.7939024 // degrees/day
with this one:
RotationRate 810.7939024 // degrees/day

It was just a minor typo.