In the case of IS doing that gets you IIS for the entire solar eclipse exactly. Additionally, an extendable moonfire cast right at the end of wrath eclipse will pretty reliably last through the end of lunar eclipse. As you get back into the pre-solar phase there's a few situations that can come up:
If your eclipses both procced pretty quickly (4.5 seconds average) you only cast one moonfire for that cycle; it gets fully extended and it lasts through lunar eclipse and pre-solar.
If they proc slowly you cast a second moonfire during your pre-solar phase. If the starfire right before that moonfire procs eclipse in which case the moonfire doesn't get extended, but replaces a starfire that you would have cast during your solar eclipse.
If they proc slowly and the starfire before your moonfire doesn't crit the moonfire gets extended atleast twice and is up for the small crit buff to help proc solar.
All these situations seem pretty good if it's the case that the only dot worth casting for its own damage is an extended moonfire and otherwise you need to maximize their IIS effect to make them worthwhile. In the case of moonfire casting whenever IS wears off is very close to casting right when solar ends under these conditions though, so there's not much difference there.

If you cast IS right at the end of lunar you either proc solar quickly, in which case the IS doesn't wear off until nearly the end of solar and is not worth recasting (meaning less than 6 seconds left on your eclipse if I remember right from earlier posts). In that case you trade off the IIS boost to any wraths left in that eclipse and the first couple pre solar wraths for another eclipsed wrath (a very small gain at that 6 second mark, growing with faster eclipse procs).
If you proc slowly and IS wears off in time to recast it you gain the IIS bonus on any wraths in your next pre-solar phase after the first couple and the damage of another IS, but lose the IIS bonus on one eclipsed wrath and extend your whole cycle by a GCD. I assume that's a net loss since it is slightly less than you'd gain by casting IS right when solar procs then again right when that wears off which we know isn't desirable with an unglyphed IS.

For what its worth, when i first got 4T10 I set up some simucraft comparing a couple one dot rotations with full dot uptime and different glyph sets and this rotation was the best without glyph of IS (this was before starfall changes so full uptime with all glyphed dots was still best).

I really think this stuff has to be looked at with simulations over formulation tools because the small changes and variations in time to proc eclipse have pretty significant effects on dot uptime with this priority.

One fairly significant difference is that WrathCalcs says IS never benefits from NG. That is too pessimistic. If you had 100% crit, every IS would benefit from NG, and IS would never cause you to lose NG.

Earlier versions of WrathCalcs assumed that IS behaved the same as Wrath for NG. That was too optimistic. IS can benefit from NG, but can't generate it. Casting IS increases the chance that a later cast will occur without NG.

I also believe Robot's default 'Lag' settings are more optimistic than WrathCalc's default 'Delay' settings. Higher delay favors long casts (SF). I'm not sure I know what Robot's default Lag settings are though. I think it remembers my last setting, and I don't know how to make it go back to the default.

Someone else posted that Mr. Robot undervalues the 4t10 bonus. If correct, that bug makes your nukes look worse (and IS better, by comparison).

Whether a 'twisting' rotation between Eclipses is optimal depends very much on your personal haste rating, glyph choices, and the distance between you and the boss. Assuming a case in which you run with SF/MF glyphs, if you are standing in melee range, the travel time of Wrath is negligible and thus your first SF after a Wrath has procced will benefit from Eclipse immediately, ensuring maximum use of the Eclipse period; there is the added benefit of ensuring that in the case of Eclipse being slow to proc, your MF will have been fully extended, which is not the case with a non-twisting rotation. A 'twisting' rotation is likely to be optimal in this situation.

The issue becomes more complicated as the travel time of wrath increases, and there is a point at which the combination of your haste and the travel time of Wrath causes your SF in the 'twisting' rotation to land fractionally before Lunar Eclipse procs. You will have queued your next spell to be a Wrath, and you lose some benefit of the 'twist' which you might previously have had. If you don't run with MF/SF as your glyphs, there might be no benefit received. Lunar Eclipse is preferred to Solar eclipse, too, and procs faster on average: it is rarely better to hope to use SF to proc a Solar Eclipse, unless there are peculiarities related to the fight mechanics that would make it so (you know you will have to move soon, for example, and thus a Lunar Eclipse will be wasted while you may gain some use from Solar)--and in those cases, you should be aiming to proc Solar anyway.

The above assumes that if you are not using a 'twisting' rotation, you are also not timing DoT refreshes to gain an advantage in seeing whether a cast has procced Eclipse to smooth your transition, nor that you are switching to a SF on a Nature's Grace proc from a Wrath. I argue that 'twisting', in real raiding terms (i.e. you are probably not standing in melee range, and post 3.3 you might well not have both MF and SF glyphs) has negligible benefits over a simple rotation (no clever timings on refreshes or switches)--if you compare it to a 'smart' rotation (using your DoT refreshes to enable your travelling Wraths to hit the target, or to break between Starfires in a post-Lunar phase to ensure that the next spell you queue is the optimal one, or even switching to SF on a Wrath NG proc, or after a fixed number of Wraths which are all in transit to the boss) then it is likely to fall behind.

The default Lag setting for Robot is 150 (if memory serves). My latency tends to be in the 75 to 50 range, so in both Wrathcalcs and Robot, I've modified the value to reflect this. I'm aware of the 4t10 bug (as I'm the one who brought it up), but I wasn't aware of the way NG worked with IS as far as WrathCalcs goes. Even still, I don't believe the difference is so great that it would generate a swing of nearly 200 dps between the two models.

As far as the simulator goes, the best results that I have gotten are (avoiding Focus glyph) with actually using the glyphs of Starfall, Starfire, and Insect Swarm, but setting Moonfire not to refresh if Solar Eclipse is up and setting Insect Swarm not to refresh if Lunar Eclipse is up. Essentially, it reapplies the DoTs only if the appropriate effecting Nuke is in rotation currently. I haven't been successful in noting any fringe benefits for these refreshes (such as casting IS as Lunar Eclipse is ending or only refreshing IS if there are X seconds left on Solar Eclipse). It may be that the DPS gains for these tactics are so minimal that basic RNG wipes them out...

In any event, I was able to consistently achieve about 150 to 200 more DPS using this method than other glyph/rotation combinations.

EDIT: It should be noted that is you do use the Focus/Starfall/Insect Swarm setups, you will gain more DPS by dropping Moonfire from your rotation entirely. The difference seems to be ~60 DPS on average. More interestingly though, the difference between Focus/Starfall/IS without MF vs Starfire/Starfall/IS (using the rotation I mentioned above) is very minimal, a difference of ~30 DPS. I'm not sure if the 18 yards you lose from Focus is worth such a small difference in damage, but I'll keep tweaking things as I haven't really looked much into rotations using Focus yet.

Did you compare moonfire/starfire/starfall to IS/starfire/starfall ace?

At least from this patch on, spamming moonfire while moving might actually be not quite so much a dps loss since we won't be using the glyph anymore, the initial portion damage, will be much higher and should count for something.

Remember in the days before moonfire glyph, you would sometimes spam it while moving simply because of the instant damage portion.. might be high time to remember that Moonfire isn't relaly a fully fledged DoT like Insect Swarm.

I was hoping blizzard would give a second Moonfire and IS glyph just like they gave a second Rejuv glyph. The MF glyph would focus on a heavier intiial damage and probably slap on a 3 second cooldown, whiles the IS glyph will allow IS to crit. Now try making 3 glyph suggestion Probably Starfall, new MF glyph and new IS glyph: Perhaps in cataclysm, a better designed druid talent trees will enable a balance druid to emphasise on stronger DoTs [possibly by a certain route down the balance tree couple with modified feral talents that are now have useful bits for balance] or heavier nuke damage through a slightly different balance path and resto off spec.That way you can choose your 4 glyph slots to as IS, new IS, MF and Starfire glyphs if you are going DoT heavy,

Yes, I did. I actually started with that combo before moving on to the one I described above. Like I said, it was strange to me that not casting IS was giving me lower results, even without the glyph. When I put the IS glyph on in place of the MF glyph, the difference was even greater. And like I said before, amusingly the difference between Starfire and Focus seems to be about 30 dps.

I've updated the explanation on the Team Robot site to reflect what Erdulf said: spells like wrath that are limited by the GCD rather than their cast time will incur the GCD Lag penalty before the next action can be performed, just like chain-casting an instant like moonfire.

Does this imply that we need 3% additional crit (137.7 critrating) to hit the lunar critcap, since theres no MF on the target ? Would be nice to see this mentioned in the guide. Does Wrathcalcs takes this into account, while calculating the scale values?

So the rotation stays the same as in 2a) ? Keeping IS up nearly all the time and cast MF only while moving?

Thanks in advance.

Yeah, I'll have to change the sheet. Should be easy, although I might wait to see exactly what rotations seem worth including in the next version.

The provisional version with a quick "one DoT after Eclipse" rotation is still here: Moonkin Raiding . You can use that to play with different glyphs/rotations. I should probably try to put in something a bit more final before the patch goes live.

The discussion has been really good since the new thread by the way, I've just been doing other stuff for a few days. To suggest one thing for people who are already playing with rotations in Robot (I haven't gotten around to it yet)--it should be able to take into account the "NG clairvoyance" effect in a way that WC can't really easily. It would be nice to set up a rotation that refreshes DoT's after the final nuke of Eclipse and then checks NG during the GCD to see whether to swap nukes immediately or not. Also, people trying out rotations in Robot should post the actual rotation they're using.

To get people started on Mr Robot actions:

To use IS only before, or near the beginning of Solar:

Ability IS only if(NOT(target has IS) AND ((Solar is ready) OR (target has Solar and <= 5s has elapsed)))

To try switching to SF when you're trying for Lunar, and have a Nature's Grace that is probably (not certainly) from a Wrath currently traveling, put this ahead of the current Wrath action. You'll keep the simple SF at the end of the action list:

Ability SF only if((Lunar is ready) AND (NOT(the previous action was SF) AND (target has Nature's Grace and <= 1.3 sec has elapsed) AND NOT (target has Starfall)))

I know that our Target's don't get Nature's Grace or Starfall buffs, but Mr Robot is a bit imprecise. These rules seem to do the right thing.