Awesome Stalker Mod

Link
Just check out some of the changes:
# Natural multi-phase day and night transition, based on daily observations.
# Vast distant views, creating large open world around player.
# New multi-phase moon design authored by Dolgov Studio.
# Proper sun travel according to date (01.05.2012) and geo location (Ukraine).
# Number of weather cycles multiplied.
# Different types of storms, from fast to slow.
# Wet surfaces during rain.
# High resolution star constellation map.

Time to play it for those who haven't yet.