Bug 414216 - constellation names and boundaries move in respect to constellations for dates centuries ago
Summary: constellation names and boundaries move in respect to constellations for date...
Status: CONFIRMED
Alias: None
Product: kstars
Classification: Applications
Component: general (show other bugs)
Version: 3.4.1
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Jasem Mutlaq
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-11-16 21:00 UTC by Heiko Evermann
Modified: 2020-04-16 20:15 UTC (History)
1 user (show)

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Description Heiko Evermann 2019-11-16 21:00:25 UTC 
SUMMARY
When going back a long time ago, e.g. 500 BC, then the constellation names and constellation boundaries move in respect to the constellations. They are no longer within their boundaries. The names however still match the constallation boundaries. 

STEPS TO REPRODUCE
1. start kstars, show constellation boundaries and names
2. enter year= -500
3. go

OBSERVED RESULT
constellation boundaries no longer match the constellations

EXPECTED RESULT
they still should


SOFTWARE/OS VERSIONS
Windows: current binaries
macOS: 
Linux/KDE Plasma: current ubuntu
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Comment 1 TallFurryMan 2020-04-16 20:15:31 UTC 
Constellations are located with a RA/DEC mid-point that is unrelated to stars actually. That mid-point is used to render the constellation art in the sky representation.

SkyQPainter::drawConstellationArtImage only uses EquatorialToHorizontal to compute the position of the image, thus locate the drawing in J2000. So, yes, bug confirmed for me.