Stars jump at transition to and from Daylight Savings Time

[Barry Scott]

Running Stellarium in the UK, so GMT and BST are the two timezones.

Open the Date/Time window, pause the time and manually set the date and time to midday on 1st March 2014.

Find the Sun and position it in the middle of the screen.

Step the days forward manually 1 day at a time by clicking the "up" day button on the "Date and time" window. When the date changes from 29th to 30th March (GMT to BST), the Sun will step suddenly to the left, by approx 15 degrees.

Fast forward to October and step the days forward. When the date changes from 25th to 26th October (BST to GMT), the Sun will step suddenly to the right, by approx 15 degrees.

It appears that Stellarium is adjusting for Daylight Savings Time, but there is no way to disable this setting.

If, instead of clicking on the arrow, you use the "=" keyboard button to step the days forward, the Sun does not jump sideways, instead the time steps forward or backward by 1 hour at the Daylight Savings Time transition date.

The user should have more control over how Daylight Savings Time is handled when manually adjusting the date and time.

[gzotti (georg-zotti)]

The ways to operate are different but consistent. On the date panel you set time, so DST jump is expected and correct. With hotkeys you shift intervals, also OK.

A solution would be to use a timezone (via TZ plugin) which has no DST.