Method getStarBrightness

src/main/java/net/minecraft/world/World.java:1593–1599

How bright are stars in the sky

(float partialTicks)

     * How bright are stars in the sky
     */
    public float getStarBrightness(float partialTicks)
    {
        float f = this.getCelestialAngle(partialTicks);
        float f1 = 1.0F - (MathHelper.cos(f * (float)Math.PI * 2.0F) * 2.0F + 0.25F);
        f1 = MathHelper.clamp_float(f1, 0.0F, 1.0F);
        return f1 * f1 * 0.5F;
    }

    public void scheduleUpdate(BlockPos pos, Block blockIn, int delay)
    {