Typing the following example command in the command block:

execute @e[type=arrow] ~ ~ ~ tp ^ ^ ^1 facing @e[r=7,c=1,type=!arrow,type=!player] true

..does not teleport the arrows into the nearest entity within 7 blocks of radius into a non-arrow, non-player, single entity; instead, the arrow travels relative to the Sun's direction. The same thing with the following command happens as wel:

execute @e[type=arrow] ~ ~ ~ tp ^ ^ ^1 facing @e[r=7,c=1,type=!arrow,type=!player]

Other entities, such as the player, works perfectly fine as I can teleport where I am facing at. However, the arrows do not.