Culmination Line incorrect on Alt vs Time on Graphs tab

[Paul Shephard]

Hi all, 

I have noticed that the Culmination line for a selected object on the Alt vs Time Graph in the Astronomical Calculations plug-in is not correctly positioned. It appears to 'snap to' the nearest hour closest to the vertex of the altitude curve rather than be positioned at the vertex itself. I am using Windows desktop version 25.4 (with Qt5).

For example, 15/02/2026 19:00, at my latitude approx. 52.5 N. The info shows Sirius transits at 21h 10m. The curve of the graph shows correctly, but the culmination line is offset to the 21h mark. Similarly, Menkar (alpha Cet) transited at 17h 28m, again, the curve looks correct, but the culmination line shows 17:00.

Am I missing something very, very basic? I didn't see anything like this in the list of outstanding fixes, but apologies if this has already been logged (or if I am missing something very, very basic).

Cheers

Paul

[Sylvain Simard]

Same observation on my system (Windows 11 Pro, 25H2) and Stellarium 25.3+ (with Qt6.10.1).

Sylvain

[Paul Shephard]

Thanks for confirming Sylvain.

Paul