The Fornax constellation's lines include the constellation lines of the constellation Eridanus

[13-Characters]

Describe the bug
When rendering only the constellation lines of the constellation Fornax, the constellation lines of Eridanus and Fornax both display.

To Reproduce
By running these lines of code, I found that the constellation lines for Fornax are not correct.

from starplot import MapPlot, Projection
from starplot import Constellation

# Draco
p = MapPlot(
    projection=Projection.LAMBERT_AZ_EQ_AREA,
    ra_min=1,
    ra_max=5.5,
    dec_min=-60,
    dec_max=5,
)
p.constellations(labels=None, where=[Constellation.constellation_id=='for']) # show Fornax constellation lines only
p.stars(mag=6, labels=None)
p.gridlines(labels=True)
p.export("charts/fornax_chart.png")

Expected behavior
I expected fornax_chart.png to look like this:

and I expected eridanus_chart.png to look like this:

Screenshots
Instead, fornax_chart.png looks like this:

and replacing p.constellations(labels=None, where=[Constellation.constellation_id=='for']) with p.constellations(labels=None, where=[Constellation.constellation_id=='eri']) results in this image:

Environment Details (please complete the following information):

• Starplot version: v0.12.3
• Python version: 3.10
• Matplotlib version: 3.9.2
• OS: Windows

[steveberardi]

ahh, this is a bug in the constellations data. It's happening because the center of Fornax and/or Eridanus are incorrect. I'll add this to the roadmap to fix 👍 For now, a workaround to get the result you're looking for is to use the Constellation's iau_id field instead:

p.constellations(
    labels=None,
    where=[Constellation.iau_id == 'for'],
)

Thanks for reporting this!