What is the difference between "depend on" and "determined by"?

I think they have almost identical meaning, and can be used interchangeably…

How I read it:
Depend (affects decision)
Determine (makes decision)

Examples:
Whether or not we go on a picnic today depends on the weather. Whether or not we go will be determined by your dad.

Which team goes first will be determined by the coin toss. Who wins the game depends on how they play.

I think they’re pretty interhchangeable, but “depend on” sounds less awkward than “determined by.”

I can’t think of a difference either, except that I would only use “determined by” in a business report.

If x depends on y then y is one of possibly several factors determining x. For example, you might say that how you spend your weekend depends on the weather. Determines is stronger and means is the sole condition for something. Where you go to vote is determined by where you live.

You depend on someone to do something.

An outcome is determined by an event that went before it.

If something “depends on” something, then (literally translating) it “hangs from” that thing. A dependency is a necessary condition, so if a depends on b, then b → a (b implies a) in formal logic.

If something “is determined by” something else, then it contains some value which is a result of that thing. If a is determined by b, then b causes a to be something. There could be some default value of a (like the empty set, or 0, or something else) that a has in the absence of b (in which case a is still determined by b, since it’s b’s absence that gives a its value). In that case, a is determined by b, but a does not depend on b- since a can exist with or without b, but a’s value is determined by that of b.

In my opinion, if you depend on someone, you’re waiting for them to do something FOR you. If you’re determined by someone, they become your inspiration and encouragement to do something.