Creating a sphere

Greetings,
i am trying to create a sphere that will be tangent to a specific family on Top of the bldg
not sure what should I select as for nodes
can someone support please

First: Don’t mistake Dynamo geometry for Revit geometry
If you want to do this in Revit, what would be the steps to do it?
Make a list of all mouse clicks and functions you would use in your mind, then write them down in a script

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Thank you for the advice Marcel
but as it’s clear that you can Do with Dynamo anything that can’t be done using Revit

If you already have the sphere family find the vector and length minus the diameter to make it touch
So Element.MoveByVector is the node you need

No I need also to create the sphere , it doesn’t exist
Noted i will use the node mentioned above

If you don’t have it in Revit yet, you grab get the geometry of the roof in Dynamo with the Element.Geometry node.
Create the sphere in Dynamo and make it touch
Then use the Spring Nodes Package node
image
It creates the family for you in the exact position