I am a little world made cunningly
Of Elements, and an Angelike spright,
But black sinne hath betraid to endlesse night
My worlds both parts, and (oh) both parts must die.
You which beyond that heaven which was most high
Have found new sphears, and of new lands can write,
Powre new seas in mine eyes, that so I might
Drowne my world with my weeping earnestly,
Donne is addressing God as “You which beyond that heaven”, a direct invocation. 
 Traditional renderings of heaven in the medieval period gave it seven levels, or seven heavens. The highest heaven, the  empyrean  or  empyreal , was to be a realm of pure beauty and purest fire.
I am a little world made cunningly Holy Sonnet V