Thanks to Uliko for posting the formula, I based these simple math calculations off of it.
http://elitistjerks.com/990017-post110.html
Haste ratings were derived from the information provided by Whitetooth at:
http://elitistjerks.com/f31/t29453-c...gs_level_80_a/
Here is how much haste you need to reach a 1 second GCD on spells affected by different ranks of Gift of the Earthmother
Wrath of Air and Improved Moonkin Aura/Swift Retribution Aura
0/5 GotE = ~38.7% Haste = ~1269 Haste Rating
1/5 GotE = ~30.8% Haste = ~1010 Haste Rating
2/5 GotE = ~23.8% Haste = ~781 Haste Rating
3/5 GotE = ~17.5% Haste = ~574 Haste Rating
4/5 GotE = ~11.9% Haste = ~391 Haste Rating
5/5 GotE = ~6.7% Haste = ~220 Haste Rating
Wrath of Air only
0/5 GotE = ~42.9% Haste = ~1407 Haste Rating
1/5 GotE = ~34.7% Haste = ~1138 Haste Rating
2/5 GotE = ~27.5% Haste = ~902 Haste Rating
3/5 GotE = ~21.1% Haste = ~692 Haste Rating
4/5 GotE = ~15.2% Haste = ~499 Haste Rating
5/5 GotE = ~9.9% Haste = ~325 Haste Rating
Improved Moonkin Aura/Swift Retribution Aura only
0/5 GotE = ~45.63% Haste = ~1497 Haste Rating
1/5 GotE = ~37.4% Haste = ~1227 Haste Rating
2/5 GotE = ~30.03% Haste = ~985 Haste Rating
3/5 GotE = ~23.42% Haste = ~768 Haste Rating
4/5 GotE = ~17.44% Haste = ~572 Haste Rating
5/5 GotE = ~12.02% Haste = ~395 Haste Rating
I tried not to round down but if I did it was at the ten thousandth level and in most cases I just rounded up regardless of the decimal, especially with the haste rating.
It's funny how much time I just spent on this, good thing I opted out of the staff meeting going on right now!