I made no visual inspection of these charts/maps. Maps were produced by bash scripts, trivially edited from their 2025 versions by changing the dates for those years to the demanded calendar dates for 2026.
The 1st script: allsky16.sh with the updated calenadar dates; it creates the needed directories (and makes allsky maps within them) Mmmdd, symlinked to .mm-dd ones (which exist, but are not shown by Apache).
Within the directories, scripts for individual constellations and dates are then used with proper dates and old *.tex files. Maps are mostly for 21 h of local time. But some scripts in directories, around solstices, have been adapted to create maps for later times for high latitudes. Such times, that the Sun is at least 14 degrees deep. Then, MonDa.sh was run before the remaining scripts, as it creates lists of dates/latitudes to be put into the latPDFset*.sh scripts instead of the old ones.
all_sh.zip contains all *.tex and *.sh files used to produce the current set of maps.
All-sky maps are all for 21 h local mean time of the given date, even if civil or nautical twilight is still in progress in high latitudes. Local time is different from the ‘civic’ time, if your longitude is different from that of the standard meridian for that time band. Being 10° westwards means your local time is 40 min lower. And during SummerTime, the local mean time is another 1 h less.
If you observe at another local sidereal times, you may use the 2025, 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014 maps, or 2012 maps (having an alternative for rather turbid air), or 2011 maps. Of course the planets were elsewhere those years, and brighter or fainter. Maps for 2011 and 2012 are for January-April only. Their pleasant feature is, they have a screen-friendly variant of white stars on a grey background. Should I add that kind of charts again?
For cases the sky luminance is very high and almost no stars are visible (as during twilight), the all-sky maps may be useful, available in subdirectories "A" or in the "latitudes" directory.
(I usually forget to change some dates, like leaving 2024 instead of changing it to 2025. A command "grep 2024 */*/*.sh" showed then the omissions, then I have corrected them.)
Jenik, Hollan at mail.muni.cz