Hi,

If I select 2 objects, if I would like to rotate them I could use the classical gizmo rotation, but is not precise, and if I enter a value in the modify panel, it apply only a local rotation for each object indepently if I select local or parent rotation in rotation dropbox.
Is there a way to permit to enter a value for a global rotatrion somewhere, if not WHY???

View on top of the two objects
76% of original size (was 665x19) - Click to enlarge

Rotation with the Gizmo, OK
76% of original size (was 665x19) - Click to enlarge

Rotation with a value in modify panel apply a local rotation for each object!
76% of original size (was 665x19) - Click to enlarge

Thank you

Regards
Franck

You don't mention how you intend to use the 2 objects shown in your screen shots, will they always be rotating/moving at the same time or not?

If both objects will always move in unison then you can select one of them right click on it, select Attach from the menu and finally click on the other object. Any moving/rotation after the attachment is controlled by selecting the parent object.

If however you have the need to at sometime rotate/move either of them independent of the other then it would be better to add a dummy object to the scene and attach both items to that. Selecting the dummy object as the parent will move both of the other items as required, while still giving you the option of selecting each one individually for movement if required.

Gerry

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System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.

Is there a way to permit to enter a value for a global rotation somewhere, if not WHY???

Just to clarify a little more.
Regardless Local, or Global, individual object is always rotated around its Pivot.
When 2, or more objects are selected, the resulted Pivot is located at the medium between all selected objects Pivots.
You CAN also modify individual pivot for objects and place it precisely at the medium between 2 object (play with Edit Pivot).

Otherwise as Gerry pointed attach them to a dummy...