Yeah, like @stephen-nagai said
Just cast starfall on CD, but im not 100% sure if it really has to be in your Eclipse windows or not. The text for the Eclipse is kinda tricky so im not sure and i havent read anything that would said its a big boost. All i really seen is that Starfall lengthens your dots by 4 seconds, so there is that i guess. Also, i havent experimented myself but It might be worthwhile to just tab through targets and only cast your dots during the different eclipses, but yeah I dont know because i havent tried to experiment that and likely wont. your dots provide Astral Power and after level 49 its even more Astral Power generated because of the Shooting Stars spell and that can even be boosted with your level 50 talent Solstice but who knows. This is all just theory.
The Theory behind what i just said and with information i have stated before is this, your dots take a ton of time to cast, and if you are in an AOE situation, thats alot of dots to cast if you were to cover the group with dots soooo. Being as your dots provide AP and after level 49 they provide more AP and with the level 50 talent they fall more often thus providing even more AP. That all being said, I think its very possible that you could just go through the group and maintain the right dot in the right eclipse, for instance Sunfire in Solar Eclipse and Moonfire in Lunar Eclipse. You could spec that your Moonfire does 10% more damage and hits an additional target but then you would lose 15% damage on your Starfall and with that the ability to cast and move so i dont think its worth it because Starfall is like dropping an Atomic bomb lol. Your Sunfire already does AoE damage and your Moonfire is well just an additional DoT and AP provider through all of this.
Take all of this with a grain of salt because I think everything i wrote is only theory, being as i dont main Balance Druid, well that and mine is only level 45 .
Also the difference between the two single target version i sent you is that in Tab one, Starsurge is cast on CD and in tab two, it is only cast twice per Eclipse and then the rest of the AP is saved for the next Eclipse or in better times of need. It is just how i did it with Theory, so i get my dots out and two Starsurge boost at the beginning of the Eclipse and not through it if you know what i mean.
Below is two macros that could be what you are looking for. I edited tab 1 (your standard macro variant) to be your normal AoE rotation and tab 2 is now that theoretical AoE version where it casts 2 of the opener spells and then the DoTs. You use it a little different, when your Starfire says a number 2 for instance, you turn it on and use only that till wrath has the 2. This is because you use 2 Starfires to enter Solar Eclipse but being as you are casting both dots it doesnt matter to switch to Wrath macro. You only switch when Wrath is no longer empower and the next macro casts the two Wraths and empowers Starfire, but that doesnt matter because you are only casting DoTs you know, then when it says 2 you switch and ya so on and on. Like i stated before its all theory, just something to play around with. Let me know if you have any issues or need any other help
Your AoE Solar macro
Click here for macro
Your AoE Lunar macro
Click here for macro
Reposted the macros so they should no longer be read only