Apocalypse
Czar = Emperor
Dickinson uses the masculine title 'Czar' (emperor), not 'Czarina.' She claims absolute power through a male role.
Eclipse metaphor
An eclipse blocks light—her girlhood is now hidden behind marriage. 'Soft' suggests gentle concealment, not violence.
Heaven/earth reversal
Those in heaven look back at earth as distant and strange. She's reversed the usual view—marriage is heaven, girlhood is the lost world below.
Command to self
The exclamation point and dash make this urgent. She's literally stopping herself mid-thought, refusing to continue the comparison.