So the sphere is actually a, “hole in the multiverse, hovering in space and stabilized by a magical field surrounding it.”
If it is hovering at a specific point in space when unused, wouldn’t the movement of the planet cause you to fly away from it (or into it) at a few thousand miles per hour, assuming your planet is in some form of orbit?
This issue is not specific to the sphere. All sorts of spells and effects target a "point in space" without really discussing what that means. In every case we have to assume that there is a frame of reference for that point; with the standard being the surface of the plane of existence where you are standing. But then what if you are floating in a void, or standing in a castle on a floating chunk of earth which is drifting slowly above the ground, or you are on the back of a gargantuan turtle or a huge boat sailing in the ocean, or riding in a large wagon? I think the DM determines the standard frame, and if there is a possible other frame that might be possible then the caster can manage it with an Arcana check of the required difficulty. So on a big boat the standard frame might still be surface off the earth, but the caster could try to tie a spell location to the boat, with the DC being higher for a smaller boat. I think we can assume, however, that there should be no issue with planets revolving. These fantasy universes have no concept of planets that revolve or orbit anything.
So the sphere is actually a, “hole in the multiverse, hovering in space and stabilized by a magical field surrounding it.”
If it is hovering at a specific point in space when unused, wouldn’t the movement of the planet cause you to fly away from it (or into it) at a few thousand miles per hour, assuming your planet is in some form of orbit?
Why do you assume you are on a planet? Your world could be flat , carried by four elephants, on the back of a turtle.
But seriously folks, don't try to bring real-world physics into the game. That way madness lies.
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So the sphere is actually a, “hole in the multiverse, hovering in space and stabilized by a magical field surrounding it.”
If it is hovering at a specific point in space when unused, wouldn’t the movement of the planet cause you to fly away from it (or into it) at a few thousand miles per hour, assuming your planet is in some form of orbit?
Technically, yes. But this is D&D. That magic item is one where we use the willing suspension of disbelief.
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I’ll accept that.
This issue is not specific to the sphere. All sorts of spells and effects target a "point in space" without really discussing what that means. In every case we have to assume that there is a frame of reference for that point; with the standard being the surface of the plane of existence where you are standing. But then what if you are floating in a void, or standing in a castle on a floating chunk of earth which is drifting slowly above the ground, or you are on the back of a gargantuan turtle or a huge boat sailing in the ocean, or riding in a large wagon? I think the DM determines the standard frame, and if there is a possible other frame that might be possible then the caster can manage it with an Arcana check of the required difficulty. So on a big boat the standard frame might still be surface off the earth, but the caster could try to tie a spell location to the boat, with the DC being higher for a smaller boat. I think we can assume, however, that there should be no issue with planets revolving. These fantasy universes have no concept of planets that revolve or orbit anything.
Why do you assume you are on a planet? Your world could be flat , carried by four elephants, on the back of a turtle.
But seriously folks, don't try to bring real-world physics into the game. That way madness lies.