Divine Sense vs the Invisibility spell

How does a Paladin's Divine Sense (or the spell Detect Evil and Good) interact with an undead or a fiend who is also invisible? Does knowing the location of a creature counts as "If a creature can somehow see you" for targeting the creature with a spell and avoiding the disadvantage to your attack and advantage to their attacks ?

Divine Sense. As a Bonus Action, you can open your awareness to detect Celestials, Fiends, and Undead. For the next 10 minutes or until you have the Incapacitated condition, you know the location of any creature of those types within 60 feet of yourself, and you know its creature type. 

Invisible [Condition]

While you have the Invisible condition, you experience the following effects.

Surprise. If you’re Invisible when you roll Initiative, you have Advantage on the roll.

Concealed. You aren’t affected by any effect that requires its target to be seen unless the effect’s creator can somehow see you. Any equipment you are wearing or carrying is also concealed.

Attacks Affected. Attack rolls against you have Disadvantage, and your attack rolls have Advantage. If a creature can somehow see you, you don’t gain this benefit against that creature.

"Knowing the location" is not the same as "seeing". Anything that relies on sight won't work. However, you won't have to "guess the square" of where the creature is when attacking, so you won't auto-miss either.

Thanks!

So it stands to reason that you can not cast a spell like magic missile  or  sacred flame on a creature which is invisible but you know the location of, right?  :)

Quote from Jayce_Danathar >>

Thanks!

So it stands to reason that you can not cast a spell like magic missile  or  sacred flame on a creature which is invisible but you know the location of, right?  :) 

That's correct.

Just FYI, a creature being Invisible does not require you to "guess the square" they're in, either. You still know where a creature is when it's Invisible, unless it's Hidden.

That is, strictly speaking, not correct per RAW. Making a successful Dexterity (Stealth) check with the Hide action simply gives you the Invisible condition. There is no "Hidden" condition, which you know, because, like me, you created the tag for it using the "action" tag, like this: Hidden. If you are Invisible, you are Invisible. The reason for your opponent's ability to perceive you are entirely circumstantial. Your DM might rule that you can be perceived with a successful Search action, or that you give your position away by leaving footprints as you walk. When you use the Hide action to become Invisible, the circumstances which cause the condition to end are clearly defined: "you make a sound louder than a whisper, an enemy finds you, you make an attack roll, or you cast a spell with a Verbal component." This does not mean that, if you take the Hide action while Invisible, you are Super Invisible, or that you are less easy to detect than if you did not. In fact, you cannot necessarily take the Hide action while Invisible, because the Hide action requires you be Heavily Obscured or behind Three-Quarters cover or Total Cover, and the Invisible condition does not provide any cover, nor does it render you Heavily Obscured.

To get back to the OP's original question, any number of circumstances could exist that allow you to pinpoint the location of an Invisible opponent. This does not mean that you have satisfied the conditions to see them unless it explicitly says that you see them (such as with Blindsight). In fact, having an ability like Paladin's Divine Sense doesn't even allow you to "find" an opponent who is Invisible because of the Hide action. Your DM might rule that it does, or allow you to take advantage on a Search action to find them, but that's why the DM is the boss. Either way, any amount of uncountered Invisibility renders you incapable of being targeted by any spell, ability, or other effect which relies on its user seeing their target.