Wheel of Sun and Moon — ruling 1

Wheel of Sun and Moon’s replacement effect will apply to cards that would be put into the enchanted player’s graveyard from any game zone. This includes from the battlefield (if a nontoken permanent is destroyed or would otherwise be put into the graveyard), from the stack (if a spell is countered, or if an instant or sorcery spell resolves), from the player’s hand or library, and so on.

Wheel of Sun and Moon — ruling 2

Wheel of Sun and Moon won’t affect tokens that are put into the graveyard from the battlefield or copies of spells that resolve or are countered. They’re not cards, so they’ll go to the graveyard as normal, then cease to exist.

Wheel of Sun and Moon — ruling 3

If multiple cards would be put into the enchanted player’s graveyard at the same time (due to Millstone, for example), they are instead all revealed and put on the bottom of the enchanted player’s library at the same time. That player chooses what order to put them in. The order is not revealed to the other players.

Wheel of Sun and Moon : règles, fonctionnement et interactions (MTG)

Wheel of Sun and Moon is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Enchant player If a card would be put into enchanted player's graveyard from anywhere, instead that card is revealed and put on the bottom of that player's library.

How it works : Wheel of Sun and Moon

Original English text — Wizards of the Coast / Scryfall

#1May 1, 2008· Wizards of the Coast
Wheel of Sun and Moon’s replacement effect will apply to cards that would be put into the enchanted player’s graveyard from any game zone. This includes from the battlefield (if a nontoken permanent is destroyed or would otherwise be put into the graveyard), from the stack (if a spell is countered, or if an instant or sorcery spell resolves), from the player’s hand or library, and so on.
No other card is named in this ruling.
#2May 1, 2008· Wizards of the Coast
Wheel of Sun and Moon won’t affect tokens that are put into the graveyard from the battlefield or copies of spells that resolve or are countered. They’re not cards, so they’ll go to the graveyard as normal, then cease to exist.
No other card is named in this ruling.
#3May 1, 2008· Wizards of the Coast
If multiple cards would be put into the enchanted player’s graveyard at the same time (due to Millstone, for example), they are instead all revealed and put on the bottom of the enchanted player’s library at the same time. That player chooses what order to put them in. The order is not revealed to the other players.
No other card is named in this ruling.