In-ground post for hammock hanging

[Boilers23]

I have only one good hanging tree in my backyard. An undersized apple tree is about 26 feet away so hanging between the two isn't very feasible.

I'm thinking about building a post at the optimal distance with enough strength to hold one or two vertical hammocks. Ideally it would be an in-ground sleeve and removable post. Has anyone ever done this before or is there another HF thread on this (I searched but couldn't find anything)?

Here are some if my specific questions:
What should i use for the post?
At what angle should I pitch the post?
How should I anchor the in-ground sleeve?

I've got some ideas but wanted to see what the forum could come up with...