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float frequency = 60; // 5 min
integer set_daynight = 0; // 0 night 1 day
float glow_full = 0.05;

//LINK_ROOT    1   sends to root prim in a linked set
//LINK_SET     -1  sends to all prims
//LINK_ALL_OTHERS  -2  sends to all other prims
//LINK_ALL_CHILDREN    -3  sends to all children, (everything but the root)
//LINK_THIS    -4  sends to the prim the script is in
integer link_set = LINK_SET

start_glow()
{
    llSetLinkPrimitiveParams(link_set, [PRIM_GLOW, ALL_SIDES, glow_full]);
}

stop_glow()
{
    llSetLinkPrimitiveParams(link_set, [PRIM_GLOW, ALL_SIDES, 0.0]);
}

check_for_transition()
{
    vector sun = llGetSunDirection();
    integer day_night = set_daynight;

    if (day_night)
        day_night = sun.z > 0.0;
    else
        day_night = sun.z < 0.0;

    if(day_night)
    {
        start_glow();
    }
    else
    {
        stop_glow();
    }
}

default
{
    state_entry()
    {
        llSetTimerEvent(frequency);
        check_for_transition();
    }
    timer(){
        check_for_transition();
    }
}