The possessive form for the proper noun Zeus is Zeus's.
The plural possessive form of "Zeus" is "Zeuses'."
Zeus'
The possessive form for the proper noun Zeus is Zeus' or Zeus's. Either form is acceptable, however when dealing with ancient names the former is often preferred over the latter. Ultimately, it's merely a question of pronunciation. For instance, Achilles' heal is not pronounced Achilles-es heal, therefore the apostrophe is sufficient in written form. The same can also be said of Jesus, Isis, Cronus, etc.
Zeus is spelled "Zeus" in French as well.
Orbits is the plural form for the noun orbit; the plural possessive form is orbits'.
The plural possessive form of "Zeus" is "Zeuses'."
The plural possessive of "library" is libraries'.
The possessive form of else is else's, as in someone else's possessions.
The possessive form of the plural noun dependents is dependents'.
Hayden's
The possessive form for the noun man is man's.example: It is a man's right to be happy.
The possessive of the singular noun alto is alto's.
The possessive for a single country is country's (e.g. a country's borders).
Cowhand's
Zeus'
The plural is composers and the plural possessive form is composers' (just an apostrophe added).
The possessive form for the noun leaf is leaf's.Example: You can usually identify a tree by the leaf's shape.